Mechanical Engineering - Engineering Mechanics - Discussion

e is usually a positive, real number between 0 and 1.

e = 0: This is a perfectly inelastic collision. This means kinetic energy along the common normal is 0. Kinetic energy is converted to heat or work done in deforming the objects.

0 < e < 1: This is a real-world inelastic collision, in which some kinetic energy is dissipated.

e = 1: This is a perfectly elastic collision, in which no kinetic energy is dissipated, and the objects rebound from one another with the same relative speed with which they approached.

Option C is correct here because no where PERFECTLY is mentioned.

Here, e is usually a positive, real number between 0 and 1:

e = 0: This is a perfectly inelastic collision. The objects do not move apart after the collision, but instead they coalesce. Kinetic energy is converted to heat or work done in deforming the objects.

0 < e < 1: This is a real-world inelastic collision, in which some kinetic energy is dissipated.

e = 1: This is a perfectly elastic collision, in which no kinetic energy is dissipated, and the objects rebound from one another with the same relative speed with which they approached.
so answer is 0 to 1.

The coefficient of restitution (COR) 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.

A perfectly inelastic collision has a coefficient of 0, but a 0 value does not have to be perfectly inelastic.

The option is correct. The coefficient of restitution of perfectly inelastic body is ZERO. The coefficient of restitution of perfectly elastic body is ONE.

For perfectly elastic collision, e = 1.
For inelastic collision, (0 < e < 1).
For a perfectly inelastic collision, e = 0.

e is zero for perfectly plastic.
e is one for elastic bodies.
e is less than one for inelastic bodies.

Option C is correct.

Yes, it's option B.

Coeff of restitution for an elastic body is 0.

While for an inelastic body is 1.

COR for the elastic body is 1 and for inelastic is 0.
Option A is the correct answer.

Perfectly inelastic body has coefficient of restitution zero.

Elastic between 0 and 1.
Inelastic 0.
Perfect elastic 1.