1. Mechanics

Momentum — Quiz

Test your understanding of momentum with 5 practice questions.

Practice Questions

Question 1

A $0.01 \text{ kg}$ bullet is fired horizontally into a $1.99 \text{ kg}$ wooden block initially at rest on a frictionless surface. The bullet embeds itself in the block. If the block-bullet system moves with a final velocity of $0.5 \text{ m/s}$, what was the initial speed of the bullet?

Question 2

Two identical spheres, A and B, are involved in a head-on elastic collision. Sphere A has an initial velocity of $v$ and sphere B is initially at rest. Which of the following correctly describes their velocities after the collision?

Question 3

A $2 \text{ kg}$ object moving at $3 \text{ m/s}$ in the positive x-direction collides with a $1 \text{ kg}$ object moving at $4 \text{ m/s}$ in the positive y-direction. If the objects stick together after the collision, what is the magnitude of the final velocity of the combined mass?

Question 4

A $0.5 \text{ kg}$ ball is dropped from a height and hits the ground with a velocity of $10 \text{ m/s}$. If the ball is in contact with the ground for $0.02 \text{ s}$ and rebounds with a velocity of $8 \text{ m/s}$ in the opposite direction, what is the average force exerted by the ground on the ball?

Question 5

A rocket expels $0.1 \text{ kg}$ of exhaust gases per second at a velocity of $500 \text{ m/s}$ relative to the rocket. What is the thrust force produced by the rocket?