AP Momentum Impulse

A .030 kg bullet is fired from a gun with a speed of 350 m/s. If the gun has a mass of 0.9 kg, What is the recoil speed of the gun (this is an explosion)?

• 11.7 m/s

• 9.0 m/s

• 10.5 m/s

• 10 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what will the velocity of the two blobs move at?

• 3.57 m/s

• 3.2 m/s

• 10.0 m/s

• 9.0 m/s

Tags

NGSS.HS-PS2-2

The purpose of crumple zones on a car is to

• decrease time of impact.
• increase force of impact.
• increase the time of impact.
• decrease the impulse during impact.

Tags

NGSS.HS-PS2-3

A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the change in the object's velocity?

• 6.3 m/s

• 3.2 m/s

• 1.2 m/s

• 4.33 m/s

Tags

NGSS.HS-PS2-1

T/F: Jonah will always have more momentum than Lindsey

• True

• False

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. The first 9300 kg car stops. At what speed will the second boxcar move?

• 18.6 m/s

• 9.3 m/s

• 7.5 m/s

• 1.86 m/s

Tags

NGSS.HS-PS2-2

In a physics experiment, Colby and Kuta both of mass 150 kg each flail towards each other. Colby has a velocity of 2 m/s and Kuta a velocity of -1m/s. They stick together when they collide. Calculate their final speed.

• 0.5 m/s

• 1.0 m/s

• 0.33 m/s

• 0.67 m/s

A boy falls and hits his head with an impulse of 20 N·s. On sand, the boy would hit for 0.2 s. What force did the sand exert on the boy?

• 4 N

• 10 N

• 50 N

• 100 N

Tags

NGSS.HS-PS2-1

A car of mass m, traveling at speed v, stops in time t when maximum braking force is applied. Assuming the braking force is independent of mass, what time would be required to stop a car of mass 2m traveling at speed v?

• ½t
• t
• √2 t
• 2t

Tags

NGSS.HS-PS2-1

Two objects, P and Q, have the same momentum. Q can have more kinetic energy than P if it has:

• More mass than P 
• The same mass as P 
• More speed than P 
• The same speed as P 

Tags

NGSS.HS-PS2-2