4. Momentum and Collisions

Elastic Collisions — Quiz

Test your understanding of elastic collisions with 5 practice questions.

Practice Questions

Question 1

A $5 \text{ kg}$ object moving at $10 \text{ m/s}$ collides elastically with a $5 \text{ kg}$ object moving in the opposite direction at $10 \text{ m/s}$. What is the total momentum of the system *after* the collision?

Question 2

In a perfectly elastic collision between two objects, which of the following statements is true regarding the total kinetic energy of the system?

Question 3

Two objects of masses $m_1$ and $m_2$ undergo a one-dimensional elastic collision. If their initial velocities are $v_{1i}$ and $v_{2i}$ respectively, and their final velocities are $v_{1f}$ and $v_{2f}$, which of the following equations correctly represents the conservation of kinetic energy?

Question 4

A $0.1 \text{ kg}$ ball moving at $2 \text{ m/s}$ collides elastically with a stationary $0.1 \text{ kg}$ ball. What is the final velocity of the initially moving ball?

Question 5

A $2 \text{ kg}$ object moving at $4 \text{ m/s}$ collides elastically with a $4 \text{ kg}$ object moving in the opposite direction at $2 \text{ m/s}$. What is the total momentum of the system *before* the collision?