Momentum Review

a bat strikes a 0.05 kg baseball so that its velocity changes by +30 m/s in 0.1 s. With what average force was the ball struck?

• +15 N

• -15 N

• +300 N

• -300 N

• +150 N

Tags

NGSS.HS-PS2-1

A 0.05 kg lump of clay moving horizontally at 12 m/s strikes and sticks to a stationary 0.10 kg cart that can move on a frictionless air track. Determine the speed of the cart and clay after the collision.

• 2 m/s

• 4 m/s

• 6 m/s

• 8 m/s

• 12 m/s

Tags

NGSS.HS-PS2-2

If the impulse acting on two objects is the same then

• the mass of both objects is the same

• the change in velocity of both objects is the same

• the change in momentum of both objects is the same

• the amount of contact time is the same

• the force exerted on both objects is the same

Tags

NGSS.HS-PS2-2

OPEN ENDED QUESTION:

Trevor passes a 0.625 kg basketball to a teammate at 6.1 m/s. It collides with the referee's 0.095 kg toupee moving at 1.4 m/s. After the collision the ball continues forward at 5.1 m/s. Find the velocity of the referee's toupe.

• 1) M₁V₁+M₂V₂=M₁V_1F+M₂V_2F

• 2) (0.625 x 6.1)+ (0.095 x 1.4) = (0.625 x 5.1) + (.095V_2F)

• 3) 3.95 = 3.19 + (.095V_2F)

• 4) .76 = (.095V_2F)

• 5) V_2F = 8 m/s

Tags

NGSS.HS-PS2-2

A 65 kg student on her skateboard is at the bottom of a small hill at which time she has a momentum of 215 kg *m/s.

What is her velocity?

• 1) F x T = m(Vf- Vi)

• 2) 215 = 65 (Vf)

• 3) Vf= 3.3 m/s

Tags

NGSS.HS-PS2-2

A 10 kg rock at rest is broken into two pieces after an explosion. If a 4.0 kg part moves to the right at 21 m/s, find the velocity of the second piece.

• 1) M1V1 + M2V2 = M1V1F + M2V2F

• 2) 4 (0) + 6 (0) = 4 (21) + 6 (Vf)

• 3) 0= 84 + 6Vf

• 4) -84= 6Vf

• 5) Vf= -14 m/s

Tags

NGSS.HS-PS2-2

Two ice skaters meet in the center of the rink and come to rest. They now push off against one another. One skater with the mass of 54 kg, acquires a speed of 0.95 m/s. What is the speed of the other skater, whose mass is 61 kg?

• 0.47 m/s

• 0.48 m/s

• 0.84 m/s

• 0.88 m/s

Tags

NGSS.HS-PS2-2

A large fish has a mass of 25.0 kg and swims at 1.00 m/s toward and then swallows a smaller fish that is not moving. If the mass of the smaller fish is 1 kg, what is the speed of the larger fish immediately after it finishes lunch.

• 1.00 m/s

• 0.96 m/s

• 1.04 m/s

• 26 kg*m/s

Tags

NGSS.HS-PS2-2

Bean bag rounds used by police are nonlethal projectiles fired from shotguns. If a 40.0-g round strikes at 70.0 m/s and delivers all its momentum over a time of 0.15 s, what is the average force of impact?

• 18.7 x 10³ kg*m/s

• 18.7 kg*m/s

• 18.7 kg*m/s²

• 18.7 x 10³ kg*m/s²

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 3.00 kg object is moving toward the right at 6.00 m/s. A 5.00 kg object moves to the left at 4.00 m/s. After the two objects collide the 3.00 kg object moves toward the left at 2.00 m/s. What is the final velocity of the 5.00 kg object?

• -0.8 m/s

• 2 m/s

• 0.8 m/s

• -2 m/s

Tags

NGSS.HS-PS2-2