Can you have a coefficient of restitution greater than 1? It can be more than 1 if there is an energy gain during the collision from a chemical reaction, a reduction in rotational energy, or another internal energy decrease that contributes to the post-collision velocity.
What does it mean if coefficient of restitution is 1?
When e=1, the collision is elastic: there is no loss of kinetic energy . It may be convenient to consider a collision as consisting of a deformation phase, during which the shape of each body is deformed, and a restitution phase, during which the shape of each body is completely or partially restored.
Can the coefficient of restitution be less than 0?
The coefficient of restitution is a number with a value that lies in the range of 0 to 1. It can never be negative .
What has a high coefficient of restitution?
When coefficient of restitution is zero the bodies are?
The coefficient of restitution exists as a number between 0 and 1. In a perfectly inelastic collision , the difference in the velocities of two objects after a collision is zero because those objects stick together. This means that the coefficient of restitution for a perfectly inelastic collision is e = 0.
Can you give a scenario where the coefficient of restitution is equal to zero?
A coefficient of restitution equal to zero indicates a perfectly inelastic collision , where the colliding bodies stick together after collision. Examples of perfectly inelastic collisions include two colliding balls of putty or a bullet fired into a wooden block.
Can coefficient of friction be greater than 1?
The coefficient of friction can never be more than 1 .
How do you interpret the coefficient of restitution?
Values of the coefficient of restitution
If it’s on the higher side (i.e., close to 1), it suggests that very little kinetic energy is lost during the collision ; on the other hand, if the value is low, it indicates that a large amount of kinetic energy is converted into heat or otherwise absorbed through deformation.
Can the value of coefficient of friction exceed unity?
The force of friction is dependent on normal reaction and the ratio of force of friction and normal reaction cannot exceed unity .
How do you increase coefficient of restitution?
The coefficient of restitution increases as the temperature is lowered . A small hole is put in a 2.60 g table-tennis ball. The ball is allowed to bounce on tiles below a motion detector.
What happens when coefficient of restitution is between 0 and 1?
The coefficient of restitution (COR, also denoted by e), is the ratio of the final to initial relative speed between two objects after they collide. It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision .
Which of the following is true when the coefficient of restitution is equal to 1?
Perfectly Elastic Collision
In perfectly elastic collisions, the coefficient of restitution is 1.
What is the coefficient of restitution for perfectly inelastic collision?
The value of the coefficient of restitution in case of a perfectly inelastic collision is e=0 .
What does coefficient of restitution depend on?
The masses of the colliding bodies .
Is coefficient of restitution constant?
The Law of Restitution is usually stated as a constant ratio e between relative velocities of separation and approach for a particular pair of colliding objects . A more intuitive formulation is that a constant fraction 1−e2 of the total kinetic energy lost in the collision.
Does coefficient of restitution depend on height?
Johnson said, “Each time the bounce height reduces by roughly the same factor, the coefficient of restitution.” On the other hand, a physics student Paul Ryan experimentally showed that the coefficient of restitution does depend on the height ; and his graphs look similar to mine (also with large variance in the data).
Why is coefficient of friction always less than 1?
Because the coefficient is the ratio of friction force to normal force and friction force would rarely exceed normal so ratio must be between 0 and 1.
What is the largest coefficient of friction?
- Silver on Silver. 1.4.
- Aluminium on Aluminium. 1.05 – 1.35.
- Platinum on Platinum. 1.2.
- Cast Iron on Cast Iron. 1.1.
- Copper on Cast Iron. 1.05.
- Copper on Copper. 1.0.
- Iron on Iron. 1.0.
- Steel on Lead. 0.95.
Can the coefficient of kinetic friction be greater than the coefficient of static friction?
With the simple model of friction, using coefficients of static and kinetic friction, you are right – the coefficient of kinetic friction cannot be higher than the coefficient of static friction .
What if coefficient of friction is more?
A coefficient of friction that is more than one just means that friction is stronger than the normal force . An object such as silicon rubber for example, can have a coefficient of friction much greater than one.
Can a coefficient of friction be negative?
Negative friction coefficients arise when the friction force increases with decreasing load . Error bars indicate standard deviations. Details about the preparation of the surfaces and on the friction-force measurements are provided in the Supplementary Information.
Is it unreasonable to expect the coefficient of friction?
Solution : In the case of ordinary plane surfaces the coefficient of friction is less than one. Suppose the surface is such that it is so irregular and there are very minute projection and cavities on it, then the coefficient of friction may exceed unity .
Does coefficient of restitution change?
The coefficient of restitution is based on the surface properties of the ball and surface it collides with. So for a given ball the coefficient will be different for different surfaces it collides with, in this sense it changes .
Why does the coefficient of restitution decrease?
More specifically, the coefficient of restitution decreases with the increase of the initial impact velocity , and for most materials, it is significantly smaller than unity, even at very low impact speeds.
What is coefficient of restitution how it explains elastic and inelastic collision?
Answer: The coefficient of restitution (COR) is the ratio of the final to initial relative velocity between two objects after they collide . ... A perfectly inelastic collision has a coefficient of 0, but a 0 value does not have to be perfectly inelastic.
What is the range of the value of coefficient of restitution?
The coefficient of restitution (COR, also denoted by e), is the ratio of the final to initial relative speed between two objects after they collide. It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision.
What does a lower coefficient of friction mean?
The coefficient of friction, μ, is a measure of the amount of friction existing between two surfaces. A low value of coefficient of friction indicates that the force required for sliding to occur is less than the force required when the coefficient of friction is high .
What is coefficient of restitution give its value for elastic collision?
Answer: Coefficient of restitution is the extent to which a body comes back to its original position after a collision with a second body . Clearly in a perfectly inelastic collision the value of this coefficient is zero as the two bodies merge as one.
