# Coefficient of restitution and damping

• paperboy
In summary, damping refers to the reduction of oscillations due to friction, while the Coefficient of Restitution measures the loss of kinetic energy during collisions. They are not the same and have different applications. Further information can be found through a Google search.
paperboy
Can someone please explain me the difference between damping and Coefficient of restitution (COR)?

Are both the same or how do they relate to each other?

Thank you,

Damping is another word for friction. It's most commonly used in connection with oscillations. For example, a pendulum, once set in motion, does not continue for ever because of frictional forces. We say the motion is damped.
Springs in a car suspension help soften the effect of the bumps in the road. However, they are damped to stop the car bouncing up and down too much and making everyone seasick.

Coefficient of Restitution is a measure of how much kinetic energy is lost when objects collide. It expresses how elastic or inelastic a collision is.

A search on Google will find further information on both of these.

## What is the coefficient of restitution?

The coefficient of restitution (COR) is a measure of the elasticity of a collision between two objects. It is defined as the ratio of the relative velocity of separation to the relative velocity of approach between the two objects.

## Why is the coefficient of restitution important?

The coefficient of restitution is important because it helps to determine how much energy is lost or conserved during a collision. It also provides information about the material properties and surface characteristics of the objects involved in the collision.

## How is the coefficient of restitution calculated?

The coefficient of restitution is calculated by dividing the relative velocity of separation by the relative velocity of approach. This can be measured using high-speed cameras or by analyzing the motion of the objects before and after the collision.

## What factors affect the coefficient of restitution?

The coefficient of restitution can be affected by factors such as the material properties, surface roughness, and temperature of the objects involved. It can also be influenced by the angle and speed of approach, as well as any external forces acting on the objects during the collision.

## What is damping and how does it relate to the coefficient of restitution?

Damping refers to the dissipation of energy during a collision, which results in a decrease in the coefficient of restitution. This can be caused by factors such as air resistance, friction, and internal vibrations within the objects. Higher levels of damping can lead to a lower coefficient of restitution and a less elastic collision.

• Introductory Physics Homework Help
Replies
7
Views
468
• Other Physics Topics
Replies
3
Views
2K
• Mechanics
Replies
9
Views
1K
• Introductory Physics Homework Help
Replies
9
Views
1K
• Classical Physics
Replies
1
Views
830
• Mechanical Engineering
Replies
4
Views
2K
• Other Physics Topics
Replies
5
Views
106K
• Mechanical Engineering
Replies
2
Views
964
• Classical Physics
Replies
4
Views
1K
• Other Physics Topics
Replies
2
Views
1K