Types Of Collision MCQ - Practice Questions with Answers

1. On the basis of the conservation of kinetic energy

a. Perfectly elastic collision

•  In this collision,  $(K.E{)}_{\text{initial }}=(K.E.{)}_{\text{final }}$

• Coefficient of restitution e = 1

• Ex- Bouncing of ball with same velocity after the collision with ground.

b. Inelastic collision

• In this collision $(K.E{)}_{\text{initial }}\ne (K.E.{)}_{\text{final }}$

• Coefficient of restitution 0 < e < 1 

• As $(K.E{)}_{\text{initial }}>(K.E.{)}_{\text{final }}$

The loss in kinetic energy appears in other forms, such as heat, sound, etc. 

Ex- Collision between two billiard balls. The majority of collisions belong to this category.

c. Perfectly inelastic collision.

• If in a collision two bodies stick together or move with the same velocity after the collision, the collision is said to be perfectly inelastic.

• Coefficient of restitution e = 0

• An ex-collision between a bullet and a block of wood is an example of a perfectly inelastic collision, if after a collision the bullet remains embedded in the block, and the block and bullet move together.

2.  On the basis of the direction of colliding bodies 

a. Head-on or one-dimensional collision

• In a head-on collision, the motion of colliding particles before and after the collision is along the same line.

b. Oblique collision

• If the direction of motion of colliding particles after the collision is not along the initial line of motion of colliding particles, then the collision is called oblique.

• Example: Collision of billiard balls.