What Is The Law Of Inertia Drivers Ed?

What Are the Natural Laws of Driving? – Gravity: the force that pulls all objects towards the center of the Earth. Everyone and everything experiences gravity and it has a major effect on your vehicle when driving uphill or downhill.

When you are driving uphill gravity is working against you, meaning that it is pulling your vehicle in the opposite direction. You need to use more engine power in order to reach the top of the hill and to maintain the speed limit. When driving downhill, gravity will push your vehicle forward causing it to accelerate. It is a good idea to push your brakes gradually and slowly in order to slow down safely and to maintain control of your vehicle.

Inertia: The law of inertia states that:

Object at rest tend to stay at rest Objects in motion tend to stay in motion at the same speed and direction Objects may change their motion only if influenced by an unbalanced force

The law of inertia applies to your vehicle as well as objects inside of it. A car will continue to move unless it is slowed down or stopped by another force — whether it be the brakes or an obstruction. So if, for example, you are driving 55mph, every object in the car is also moving 55mph; if the car hits a wall, all objects in the vehicle still move at 55mph — hence the importance of seatbelts, air bags and other safety features.

  1. For this reason, it is important to keep loose items secured inside of the vehicle.
  2. Potential Energy: the energy that is stored in an object.
  3. The most common type of potential energy is when an object has the potential to “fall” or be pulled towards the center of the earth due to gravity.
  4. For example, when you park your car at the top of a hill, it has potential energy as gravity is pulling your car downward.

Kinetic Energy: the energy that is caused by motion. The kinetic energy of an object is the energy or force that the object has due to its motion. For example, a moving vehicle has kinetic energy and as you increase the speed of the vehicle, the kinetic energy of the vehicle increases as well.

Increased by the weight of your vehicle Decreased if your tires are over-inflated or under-inflated Decreased if your tires are worn smooth Affected by the material and condition of the road

Centrifugal and Centripetal Forces: these forces work opposite of each other and affect objects traveling on a curved path and will affect the way your vehicle behaves on the road. In order to understand these forces, imagine that any curve you drive on as part of a complete circle.

  1. The centripetal force pulls your vehicle to the center of the circle, while the centrifugal force pulls it away from the center.
  2. It is important to be aware of these forces when driving on a curved road and to find a balance between understeering (not turning the wheel enough) and oversteering (turning the wheel too much).

Momentum: the force that exists in a moving object. The momentum of an object is proportional to its weight and speed. When you are driving, you and your vehicle have obtained momentum that is based on the total weight of your vehicle and the speed at which you are driving.

Using the friction force of your brakes by utilizing your brakes, Using the friction force between your tires and the road, which is done automatically Using the compression force your engine by switching to a lower gear, if necessary

What does inertia mean in driving?

INERTIA – Inertia is the resistance to change the direction or velocity of a body, either at rest or in motion. In this case, it is related to changing the heading, or direction, of a vehicle; that is, changing from straight ahead driving to a turn. The importance of inertia and weight distribution as they relate to driving is that they affect the amount of time required to make a transition from straight to turning or vice versa.

Although these changes with the usual loading of a vehicle are not large, a driver should recognize the unusual loading of a vehicle, such as the placing of a large load on the tailgate of a station wagon (or the addition of a heavy load on the vehicle roof) will cause changes in the way the vehicle drives and adjustments should be made in driving accordingly.

Since inertia dictates that a body in motion will continue to move in a straight line, a force must be applied to cause a vehicle to turn. This force is called Centripetal force, and is a result of tires stretching to pull the car from a straight path.

  2. A. Pitch – the force felt in acceleration or braking movement around (Horizontal axis) of vehicle
  3. B. Roll – the force felt in cornering, side to side movement (Lateral axis) of the vehicle
  4. C. Yaw – the force felt in a spin movement around (Vertical axis) of the vehicle

A very important handling concept, which dictates the willingness of a car to change directional position if called Polar Moment of Inertia. “Poles of inertia” are just another way of saying “center of weight concentration”. The “moment” in this concept is determined by the front-to-rear location of the center of gravity.

  • The car turns (changes direction) about its center of gravity in a corner so the further away the centers of weight concentration are located from the center of gravity (which is their common center), the bigger the “moment”.
  • A high polar moment of inertia is present when the weight concentrations are heavy and are far apart.

The low polar moment of inertia is found when weight concentrations are light and are close together. In other words, it is easier to steer a vehicle with a low polar moment of inertia. A vehicle with a low polar moment of inertia gives a quick response to steering commands.

What does inertia mean when it comes to riding in your car quizlet?

While driving, inertia keeps your vehicle moving unless the vehicle is acted upon by something, such as your brakes, the road surface, a fixed object (such as a tree), or another vehicle. Inertia also causes your body and loose objects in the car to keep moving forward if your vehicle comes to a sudden stop.

What is inertia in a car crash?

Inertia – Labster Theory Inertia is the ability of an object to resist changes in its motion, in other words, to resist, is often called the Principle of Inertia. An everyday example of inertia and its effect on us is the effect of it during driving and braking. Figure: A seat-belt is forcing the body to stop as the car brakes in the first image. As shown in the second image, the body would continue to move with its initial speed unless a force is exerted to it by the seat-belt according to the Principle of Inertia. : Inertia – Labster Theory

What affects your vehicle’s inertia?

Newton’s second law: acceleration and braking – Newton’s second law is a little more complicated but fortunately, we do not have to delve into it too deeply here. The second law states that:

Force (F) is equal to mass (m) multiplied by acceleration (a).

What you need to take from this is that the force an object exerts is affected by its weight and the speed at which it is traveling. The greater the mass and the faster the speed, the more force the object possesses. Consequently, heavier vehicles traveling at higher speeds do more damage than lighter, slower-moving vehicles.

What is law of inertia explain?

Law of inertia, also called Newton’s first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

See also:  How To Know If Law Is For You?

What is inertia simple answer?

Inertia can be defined as a property of matter by which it remains at the state of rest or in uniform motion in the same straight line unless acted upon by some external force. Inertia is a property of a body that resists changing its state of motion or state of rest.

What is inertia example car?

Effects of Interia – You can see the effects of inertia everywhere. In baseball, for example, to overcome inertia a base runner has to “round” the bases instead of making sharp turns. As a more familiar example of inertia, think about riding in a car. You and the car have inertia.

  • Table cloth
  • 2 unbreakable plates
  • 2 unbreakable cups
  • 2 forks, spoons, napkins
  • The heavier the cups and plates, the better it works A textbook
  1. Start with the table cloth on a table or desk.
  2. Set the table as if for dinner.
  3. Notice the difference in mass of each object. The book has the most mass and the napkin has the least.
  4. Try the magician’s trick of grabbing the edges of the table cloth and then quickly jerk it out from under the items on the table.
  5. Hopefully you’ll notice that the napkin flew off (less inertia), and things like the silverware, plates and book stayed put.

Which of the following is the best explanation of inertia?

Which of the following best describes inertia? It is the tendency of an object to resist any change in its state of motion. It is the change in position with respect to a reference point.

How does the law of inertia apply to a car crash?

What is Inertia? – (also referred to as Law of Inertia) explains the behaviour of stationary and moving objects. It states that a rested object stays at rest and an object in motion keeps moving in the same speed and direction unless it’s diverted by,

  • In relation to an object’s, is essentially the resistance of an object to changing its,
  • So basically, inertia tries to keep you moving in the same direction and speed.
  • The concepts of driving involves a lot of like or etc.
  • In fact, the most unfortunate car accidents are in relations to these forces, but in particularly the force of inertia.

If a car travels at 50 km/h, that means that everything in it is also moving at that same speed. When the car suddenly stops due to either braking or crashing, inertia will force the passengers or any other objects to keep moving forward. And since the force of inertia increases with the speed, the motion can varied from a light jerk to a more serious crash.

That is why the are crucial since they can help to decrease and cancel out the force of inertia. Turning on a curve is also affected by inertia. Especially if the turn is too fast, the strong resistance would force the car to go in a straight line, which can easily cause crashes and damage to people or property.

In these situations that involve turning, going slower is always a good option for there won’t be as much inertia so the car can make safer turns.

Is driving a car inertia?

Inertia applies not only to your vehicle, but to everything inside it. Because of inertia, your car will continue to move down the road until some other force (e.g., the brakes, road conditions, an obstruction, another vehicle) slows or stops it. Imagine your car is traveling at 60 mph before you stop suddenly.

How does Newton’s first law apply to a car?

Newton’s Laws – Most people remember Newton’s laws from school physics. These are fundamental laws that apply to all large things in the universe, such as cars. In the context of our racing application, they are: The first law: a car in straight-line motion at a constant speed will keep such motion until acted on by an external force. What Is The Law Of Inertia Drivers Ed The second law: When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car. This law is expressed by the famous equation F = ma, where F is a force, m is the mass of the car, and a is the acceleration, or change in motion, of the car.

  • A larger force causes quicker changes in motion, and a heavier car reacts more slowly to forces.
  • Newton’s second law explains why quick cars are powerful and lightweight.
  • The more F and the less m you have, the more a you can get.
  • The third law: Every force on a car by another object, such as the ground, is matched by an equal and opposite force on the object by the car.

When you apply the brakes, you cause the tires to push forward against the ground, and the ground pushes back. As long as the tires stay on the car, the ground pushing on them slows the car down. Weight transfer during accelerating and cornering are mere variations on the theme. We won’t consider subtleties such as suspension and tire deflection yet. These effects are very important, but secondary. The figure shows a car and the forces on it during a “one g” braking maneuver. One g means that the total braking force equals the weight of the car, say, in pounds. In this figure, the black and white “pie plate” in the center is the CG. G is the force of gravity that pulls the car toward the center of the Earth. This is the weight of the car; weight is just another word for the force of gravity. It is a fact of Nature, only fully explained by Albert Einstein, that gravitational forces act through the CG of an object, just like inertia.

  1. This fact can be explained at deeper levels, but such an explanation would take us too far off the subject of weight transfer.
  2. Lf is the lift force exerted by the ground on the front tire, and Lr is the lift force on the rear tire.
  3. These lift forces are as real as the ones that keep an airplane in the air, and they keep the car from falling through the ground to the center of the Earth.

We don’t often notice the forces that the ground exerts on objects because they are so ordinary, but they are at the essence of car dynamics. The reason is that the magnitude of these forces determines the ability of a tire to stick, and imbalances between the front and rear lift forces account for understeer and over-steer.

Why is it called inertia?

Classical inertia – According to Charles Coulston Gillispie, inertia “entered science as a physical consequence of Descartes ‘ geometrization of space-matter, combined with the immutability of God.” The first physicist to completely break away from the Aristotelian model of motion was Isaac Beeckman in 1614.

The term “inertia” was first introduced by Johannes Kepler in his Epitome Astronomiae Copernicanae (published in three parts from 1617 to 1621); however, the meaning of Kepler’s term (which he derived from the Latin word for “idleness” or “laziness”) was not quite the same as its modern interpretation.

Kepler defined inertia only in terms of resistance to movement, once again based on the presumption that rest was a natural state which did not need explanation. It was not until the later work of Galileo and Newton unified rest and motion in one principle that the term “inertia” could be applied to these concepts as it is today. Galileo, in his further development of the Copernican model, recognized these problems with the then-accepted nature of motion and, at least partially, as a result, included a restatement of Aristotle’s description of motion in a void as a basic physical principle: A body moving on a level surface will continue in the same direction at a constant speed unless disturbed.

Galileo writes that “all external impediments removed, a heavy body on a spherical surface concentric with the earth will maintain itself in that state in which it has been; if placed in a movement towards the west (for example), it will maintain itself in that movement.” This notion, which is termed “circular inertia” or “horizontal circular inertia” by historians of science, is a precursor to but is distinct from Newton’s notion of rectilinear inertia.

For Galileo, a motion is ” horizontal ” if it does not carry the moving body towards or away from the center of the earth, and for him, “a ship, for instance, having once received some impetus through the tranquil sea, would move continually around our globe without ever stopping.” It is also worth noting that Galileo later (in 1632) concluded that based on this initial premise of inertia, it is impossible to tell the difference between a moving object and a stationary one without some outside reference to compare it against. The effect of inertial mass: if pulled slowly, the upper thread breaks (a). If pulled quickly, the lower thread breaks (b) Concepts of inertia in Galileo’s writings would later come to be refined, modified, and codified by Isaac Newton as the first of his Laws of Motion (first published in Newton’s work, Philosophiæ Naturalis Principia Mathematica, in 1687): Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon.

Despite having defined the concept so elegantly in his laws of motion, Newton did not actually use the term “inertia” to refer to his First Law. In fact, originally he viewed the respective phenomenon as being caused by “innate forces” inherent in matter, which resisted any acceleration. Given this perspective, and borrowing from Kepler, Newton attributed the term “inertia” to mean “the innate force possessed by an object which resists changes in motion”; thus, Newton defined “inertia” to mean the cause of the phenomenon, rather than the phenomenon itself.

However, Newton’s original ideas of “innate resistive force” were ultimately problematic for a variety of reasons, and thus most physicists no longer think in these terms. As no alternate mechanism has been readily accepted, and it is now generally accepted that there may not be one that we can know, the term “inertia” has come to mean simply the phenomenon itself, rather than any inherent mechanism.

See also:  What Type Of Business Is A Law Firm?

How does inertia affect speed?

Moment of Inertia

  • Q4 E Case Study 14 – Moment of Inertia
  • Proposed Subject usage: Mathematics / Physics (A/AS level), Sports Science (Degree Yr 1/2)
  • Introduction Moment of inertia of an object is an indication of the level of force that has to be applied in order to set the object, or keep the object, in motion about a defined axis of rotation. Moment of inertia, which is a derivative of Newton’s second law, is sometimes referred to as the second moment of mass and can be calculated using the equation:
  • I = mr²
  1. Where: I = Moment of Inertia (kg m²) m = Mass (kg)
  2. r = Radius (m) (shortest distance from the axis of rotation to the particle)

Higher moments of inertia indicate that more force has to be applied in order to cause a rotation whereas lower moments of inertia means that only low forces are necessary. Masses that are further away form the axis of rotation have the greatest moment of inertia.

Angular momentum of an object, rotating about an axis, is a measure of the amount of rotation of that object when no external torques are acting upon it, with torque being defined as the moment of force and is a measure of how much force is needed to cause the rotation of an object. Angular momentum is a conserved quantity, which means that it stays constant providing no external torques act upon it, and is the product of moment of inertia multiplied by angular velocity.

When the body has an increased radius, i.e. during the initial and final phase of a dive, moment of inertia is large and angular velocity is small. While in the pike position the body decreases in radius as each segment moves closer to the axis of rotation, resulting in angular velocity increasing and a decrease of moment of inertia.

  1. To find and analyse the Moment of Inertia of a forward and backward pike dive.
  2. To compare the differences in the Moments of Inertia of both dives.


The videos have been digitised and calibrated using the



  • A butterworth filter was used to smooth the data.
  • Data has been exported to an excel file where it was used to calculate the moment of inertia. Graphs were prepared using this information.
  • Still images have been captured.

Functions of the Quintic Software used:

  • Multi-Point Digitisation Module
  • Butterworth Filter
  • Calibration
  • Interactive Graph and Data displays
  • Export Data
  • Multi-Image Capture

Results Moments of Inertia were found for a backward and a forward pike dive by calculating the sum of the inertias for each segment of the body. Both dives were performed by the same diver yet the moments of inertia are different due to the distance of each segment from the axis of rotation i.e.

What Is The Law Of Inertia Drivers Ed

Divers always aim to complete the required number of somersaults and/or twists as quickly as possible leaving more time to prepare for entry into the water. In order to do this they have to increase their angular velocity, consequently reducing their moment of inertia.

This is done by changing their body configuration so as to decrease the distance between the centre of mass of each body segment and the axis of rotation, thus a tighter pike position gives the diver a smaller moment of inertia and greater angular velocity. Once the diver leaves the board, there is no torque acting on the body.

This means that angular momentum is conserved when no external torque acts on it, thus when the moment of inertia decreases angular velocity increases and vice versa. The dive is divided into 3 phases. The first phase is from when the diver leaves the board until entering the full pike position.

  1. Phase 2 is the execution of the somersaults in the pike position and the final phase is the release from the pike position and preparation for entry into the water.
  2. In phase 1, once the diver leaves the board there is no external torque acting on him, thus angular momentum is conserved and remains so throughout the dive.

When the diver first leaves the board, moment of inertia is high due the limbs i.e. the arms being outstretched and further away from the axis of rotation. Towards the end of phase 1, the diver is assuming the pike position meaning that all body segments are pulled as close as possible to the axis of rotation thus decreasing the moment of inertia and increasing the angular velocity.

  1. Moment of inertia in the second phase varies in accordance with the angular velocity so as to conserve angular momentum.
  2. By the third phase the moment of inertia increases as the diver prepares to enter the water and releases from the pike position.
  3. This is because the arms are stretched over the head and are thus further away from the axis of rotation, similar to the initial position.

The increased moment of inertia slows down the angular velocity and allows the diver to prepare for entry into the water in as straight a line as possible so as to produce minimum splash. What Is The Law Of Inertia Drivers Ed Graph 1: Moment of Inertia during a Forward Pike Dive Graph 1 shows the calculated moment of inertia of the diver during a forward pike dive. The graph has been divided into the 3 different phases. In phase 1, as the diver is leaving the board, the inertia is 10.25kgm².

After a slight increase, the inertia decreases rapidly as the diver assumes the pike position. At the end of this phase, moment of inertia is 6.86kgm². The diver is in the full pike position now and is starting the somersaults. During the dive, inertia is constantly varying between 6.86 – 9.36 kgm²; this is due to the varying angular velocity during each somersault.

As the angular velocity increases, moment of inertia decreases and vice versa hence keeping angular momentum constant throughout the dive. In the final phase, the inertia initially decreases but as the divers straightens up; preparing to enter the water the moment of inertia begins to rise.

See also:  What Is A Tribunal In Law?

Figure 1: Forward Pike

What Is The Law Of Inertia Drivers Ed

Graph 2: Moment of Inertia of a Backward Pike Dive Graph 2 shows the moment of inertia for the backward pike dive. The graph is again divided into the 3 different phases. Initially, in phase 1, the moment of inertia is 11.41kgm². Once the diver has left the board, the moment of inertia decreases and continues to decrease until the diver assumes the pike position at the end of phase 1.

Figure 2: Backward Pike

What Is The Law Of Inertia Drivers Ed

Graph 3: Comparison of Moments of Inertia Graph 3 shows a comparison between the moments of inertia for both the forward and backward pike dives. The dives were compared from the frame of last contact with the board until the diver enters the water. The moment of inertia for the forward pike is more variable throughout the dive, yet both dives still follow a similar pattern.

As the diver leaves the board moment of inertia decreases for both dives. The backward pike dive takes a bit longer to decrease fully due it taking slightly longer to reach the pike position during a backward dive. However, the backward pike dive decreases to a lower moment of inertia meaning that the angular velocity is greater and that the diver is in a tighter pike position during the backward pike.

At the end of the dive, inertia increases as the angular velocity decreases. The backward pike dive has a greater increase in the inertia due to the decrease in the angular velocity. As the forward pike dive had a slower angular velocity, there is less of an increase in inertia as the diver enters the water.

Conclusion Moment of inertia is a calculation of the required force to rotate an object. The value can be manipulated to either increase or decrease the inertia. In sports such as ice skating, diving and gymnastics athletes are constantly changing their body configuration. By increasing the radius from the axis of rotation, the moment of inertia increases thus slowing down the speed of rotation.

Alternatively, if an athlete wants to increases the speed of rotation, then they must decrease the radius by bringing the segments of the body closer to the axis of rotation thus decreasing the radius and moment of inertia. Downloads

Written Case Study Video avi. files
3m Backward Pike.avi ~3.10 MB 3m Forward Pike.avi ~3.03 MB

Moment of Inertia

How does inertia depend on speed?

Inertia doesn’t depend on velocity. Intertia is a tendency of an object to stay in motion or rest unless external forces are applied.

What causes inertia to increase?

$\begingroup$ For both interpretations, the answer is ‘yes’ since force still acts in an opposite force on anything which has mass. As you accelerate, your velocity increases and therefore mass will increase. The increase in mass will bring about an opposite force. The greater the mass, the greater the inertia. answered May 15, 2013 at 13:41 $\endgroup$ $\begingroup$ answered May 15, 2013 at 9:48 What Is The Law Of Inertia Drivers Ed raindrop raindrop 902 1 gold badge 9 silver badges 28 bronze badges $\endgroup$ 4

$\begingroup$ If we interpret the inertia as $F=ma$, then ‘yes’ again: it increases with a factor of $\gamma$ in the transversal direction, and with a factor of $\gamma^3$ in the longitudinal direction. But if we interpret inertia as $F^\mu=ma^\mu$, then it does not change. $\endgroup$ May 15, 2013 at 12:40 $\begingroup$ I’m confused, which is correct? I have read the Wikipedia, @Raindrop seem to be correct. I don’t quite understand transversal direction, sorry. $\endgroup$ May 15, 2013 at 13:44 $\begingroup$ The link for you again: en.wikipedia.org/wiki/ – and a good SR textbook is better that just Wikipedia, which is sometimes inconsistent. The “transversal” means “cross”, and the “longitudinal” means “lengthwise”, that is, the the cases when the direction of force is perpendicular or parallel to the direction of motion. $\endgroup$ May 15, 2013 at 14:41 $\begingroup$ I didn’t consider special relativity in my answer. $\endgroup$ May 16, 2013 at 5:47

$\begingroup$ I think It has more to do with acceleration than speed. What do you compare a constant speed to without knowing the inertial frame for the universe. For instance if the earth is traveling toward the constellation Leo at 390 km/s what would happen if you blasted off in a rocket in the opposite? After accelerating would you be moving 390 km/s or would you be sitting still compared to what you were doing? answered Mar 30, 2016 at 1:29 Bill Alsept Bill Alsept 3,795 1 gold badge 14 silver badges 28 bronze badges $\endgroup$ $\begingroup$ I think inertia doesn’t depend on speed, it depends on rate of change in speed, i.e. acceleration. The higher you accelerate the more will be the inertia. sammy gerbil 26.8k 6 gold badges 33 silver badges 70 bronze badges answered Jul 17, 2016 at 6:19 $\endgroup$ 2

$\begingroup$ “I think” is not a physics statement. Do you have anything to back this answer up? $\endgroup$ Jul 17, 2016 at 10:43 $\begingroup$ @ACuriousMind On my opinion, the problem with this answer is not the “I think”, but that inertia depends on speed and not acceleration. $\endgroup$ Jul 17, 2016 at 14:30

How do you explain the law of inertia to a child?

What is the Law of Inertia? – When traveling in a train or any other vehicle, have you noticed how you continue to move forward when it stops. You just experienced INERTIA! Inertia is the tendency of a body to resist a change in motion or rest. When a vehicle stops, you tend to jerk forward before coming to a complete stop.

What is inertia with example?

The inertia of Motion: When the resistance is offered by the body to continue to be in uniform motion unless an external force acts on it.e.g., the passengers fall forward when a moving bus stops suddenly due to inertia of motion.

Is driving a car inertia?

Inertia applies not only to your vehicle, but to everything inside it. Because of inertia, your car will continue to move down the road until some other force (e.g., the brakes, road conditions, an obstruction, another vehicle) slows or stops it. Imagine your car is traveling at 60 mph before you stop suddenly.

What is meant by inertia example?

The inability of a body to change its state of rest or of uniform motion by itself is called inertia. Inertia of a body depends mainly upon its mass. If we kick a football, it flies away. But if we kick a stone of the same size with equal force, it hardly moves.

Is inertia the same as speed?

The answer is – So, inertia describes an object’s resistance to change in motion (or lack of motion), and momentum describes how much motion it has. Pop quiz answer : Momentum is your force or speed of movement, but inertia is what keeps you going. The car had a change in motion (or momentum), but the giraffe resisted that change. What Is The Law Of Inertia Drivers Ed Funny Online Pictures

What does engine inertia mean?

What is a simple definition for ‘moment of inertia,’ often described as inertia in a motor? Inertia describes the tendency of a body to resist changes in rotational speed for a given torque.