💥 Momentum — Unit Quiz

A 5 kg object moves at 4 m/s. What is its momentum?

A net force of 30 N acts on an object for 4 seconds. What is the impulse delivered to the object?

Two ice skaters push off from each other and move in opposite directions. Skater A (60 kg) moves right at 3 m/s. What is the momentum of Skater B (40 kg)?

In which type of collision is kinetic energy conserved?

Two carts collide on a frictionless track (isolated system). Select ALL quantities that are conserved in any collision.

A 3 kg ball moving at 4 m/s and a 6 kg ball moving at 2 m/s in the same direction collide and stick together. What is their final speed?

A 0.1 kg ball hits a wall at 10 m/s and bounces straight back at 8 m/s. What is the magnitude of the impulse exerted by the wall on the ball?

A 1200 kg car moving at 15 m/s collides with a stationary 800 kg car. They stick together. What is the final velocity of the combined wreck?

A force vs. time graph shows a rectangular pulse: F = 200 N from t = 0 to t = 0.05 s, then F = 0. A 0.5 kg ball was at rest before the pulse. What is the ball's speed after the pulse?

In a collision between two objects in an isolated system, which quantities are ALWAYS conserved?

A 2 kg block moving right at 8 m/s collides elastically with a 2 kg block at rest. What are the final velocities?

A 60 kg person jumps from a 4 m/s moving 200 kg cart and ends up with a velocity of +2 m/s (same direction as the original motion). What is the final velocity of the cart? (System initially moves at 4 m/s)

Compare a perfectly elastic collision and a perfectly inelastic collision between two identical masses (m), one at rest and one moving at v. Select ALL correct statements.

A 0.5 kg ball moving right at 6 m/s collides elastically with a stationary 1.5 kg ball. Find the final velocities of both balls.

A 1200 kg car traveling at 20 m/s north collides with a 900 kg car traveling at 15 m/s east. They stick together in a perfectly inelastic collision. (a) Find the magnitude of the total momentum before the collision. (b) Find the speed of the combined wreck immediately after the collision. (c) Find the direction of motion of the wreck (angle from north).