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Can you have a coefficient of restitution greater than 1?

It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision. 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 if coefficient of restitution is negative?

It can never be negative. If the formular is presented in that form, the denominator represents the relative “velocity” of approach and the numerator (excluding the negative sign) represents the relative “velocity” of separation.

Does drop height affect coefficient of restitution?

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 the coefficient of restitution used?

Coefficient of restitution is a common and popular parameter used in many collision models particularly for collision without friction because of its simplicity and usually applied as constant values between zeros to one [12-14].

How do you interpret the coefficient of restitution?

The coefficient of restitution is defined as the ratio of the final velocity to the initial velocity between two objects after their collision. Another way of saying this is that the coefficient of restitution is the ratio of the velocity components along the normal plane of contact after and before the collision.

How does pressure affect the coefficient of restitution?

Based on our data analysis, as pressure increases in a basketball, it will bounce higher and the coefficient of restitution will increase also.

What does a high coefficient of restitution mean?

The coefficient of restitution is a number which indicates how much kinetic energy (energy of motion) remains after a collision of two objects. If the coefficient is high (very close to 1.00) it means that very little kinetic energy was lost during the collision.

Does coefficient of restitution depend on mass?

The coefficient of restitution does not depend either on the size of the bodies, or on their relative velocity; and it is determined only by the properties of their material.

How does surface affect coefficient of restitution?

Specifically, for a single body being bounced perpendicular off of a surface, the coefficient of restitution is defined as the speed of the body immediately after bouncing off a surface divided by the speed immediately before bouncing off the surface.

What is the maximum coefficient of restitution?

The coefficient of restitution (COR), also denoted by (e), is the ratio of the final to initial relative velocity between two objects after they collide. It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision.

What does a low coefficient of restitution mean?

close to zero

Why is the coefficient of restitution important?

The coefficient of restitution is important because it is what determines whether a collision is elastic or inelastic in nature. Determining whether a collision is elastic or not shows if there is any form of loss of kinetic energy as a result of the collision.

How can the coefficient of restitution be reduced?

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.

How does drop height affect coefficient of restitution?

If the relationship between the drop height of the object and the coefficient of restitution is the square root of an inverse then as the drop height increases, Cr should decrease.

Is the coefficient of restitution the same for each bounce?

What would a bounce coefficient of 1 imply physically?

The closer the coefficient is to one, the bouncier the object is. An object with a coefficient close to zero would have very little bounce. If an object has a COR of exactly one, this means that a perfectly elastic collision will occur in which all energy is transferred from one object to another.