Physics - Impulse & Momentum (Etkina)

A 2-kg rubber ball with an initial speed of 10 m/s bounces off a wall. Immediately after the bounce, the ball has a speed of 5 m/s. What is the magnitude of the ball's change in momentum?

• 10 kg m/s

• 20 kg m/s

• 30 kg m/s

Tags

NGSS.HS-PS2-2

A 10-k g ball Is thrown up with a speed of 9.8 m/s. Use the Impulse-Momentum Theorem to find the time It takes to reach its highest position.

• 0.5 s

• 1.0 s

• 1.5 s

• 2.0 s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Jen (50 k g) and David (75 k g), both on rollerblades, push off each other abruptly. After the push, Jen has a velocity of −3.0 m/s. What Is David’s velocity?

• + 2.0 m/s

• + 3.0 m/s

• + 4.5 m/s

Tags

NGSS.HS-PS2-2

Two identical carts travel toward each other at the same speed and collide with each other. What can we conclude? Careful! One of the choices is sometimes true, but not always true.

• The final linear momentum of the two carts will sum to zero.

• The carts will have zero velocity after the collision.

• After the collision, the carts will be moving with the same speed but in opposite directions.

• We cannot reach any of these conclusions.

Tags

NGSS.HS-PS2-2

Two carts travel toward each other on a frictionless track at the same speed and collide with each other. One of the carts has a mass 5 times that of the other cart. Which cart experiences the greater change in momentum?

• The smaller cart experiences greater change in momentum.

• The larger cart experiences greater change in momentum.

• They have the same change in momentum.

• It depends on the final speed of the carts.

Tags

NGSS.HS-PS2-2

A 1000-k g car Is moving at 10 m/s with respect to the ground when the car hits a barrier. The car is stopped in 0.5 s by the force of the barrier on the car. What is the magnitude of the average force the barrier exerted on the car during the collision?

• 2000 N

• 5000 N

• 20,000 N

Tags

NGSS.HS-PS2-1

The two boxes are sliding along a frictionless surface. They collide and stick together. Afterward, the velocity of the

two boxes is

• 2 m/s to the left

• 1 m/s to the left

• 0 m/s, at rest

• 2 m/s to the right

• 1 m/s to the right

Tags

NGSS.HS-PS2-2