AP Physics Momentum Review

A 35 kg child runs across a store at 4 m/s and jumps onto a 30 kg shopping cart initially at rest. At what speed will the shopping cart and the child move together across the store? 

• 1 m/s
• 2.2 m/s
• 5 m/s
• 6.2 m/s

Tags

NGSS.HS-PS2-2

A bullet with a mass of 0.01 kg collides inelastically with a wooden block of mass 3 kg, initially at rest. After the collision, the bullet and block has a speed of 1.2 m/s. What was the initial speed of the bullet?

• 50 m/s
• 101 m/s
• 301 m/s
• 520 m/s

Tags

NGSS.HS-PS2-2

In an experiment, a toy wooden car with a mass of 0.3 kg, initially at rest, is struck in the rear by a 0.003 kg dart traveling at 15 m/s as shown.  With what speed does the car with the dart stuck in it move after the collision?

• 0.05 m/s
• 0.15 m/s
• 3 m/s
• 10 m/s

Tags

NGSS.HS-PS2-2

Two pucks are firmly attached by a stretched spring and are held at rest on a frictionless surface. They are released simultaneously. If puck I has 3X the mass of puck II, which of the quantities is the same for both as the spring pulls the two pucks?

• Speed 
• Magnitude of acceleration 
• Kinetic energy 
• Magnitude of momentum

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

Which of the following is true when an object of mass m moving on a horizontal frictionless surface hits and sticks to an object of mass M > m, which is initially at rest on the surface?

• The collision is elastic.
• The momentum of the objects that are stuck together is smaller than the initial momentum of object m.
• The speed of the objects that are stuck together will be less than the initial speed.
• The direction of motion of the objects that are stuck together depends on whether the hit is a head-on collision.

Tags

NGSS.HS-PS2-2

Two objects having the same mass travel toward each other on a flat surface each with a speed of 1.0 meter per second relative to the surface. The objects collide head-on and are reported to rebound after the collision, each with a speed of 2.0 meters per second relative to the surface. Which of the following assessments of this report is most accurate?

• Momentum was not conserved therefore the report is false.
• If potential energy was released to the objects during the collision the report could be true.
• If the objects had different masses the report could be true.
• If the surface was inclined the report could be true.

Tags

NGSS.HS-PS2-2

An open cart on a level surface is rolling without frictional loss through a vertical downpour of rain. As the cart rolls, an appreciable amount of rainwater accumulates in the cart. The speed of the cart will

• increase because of conservation of mechanical energy
• decrease because of conservation of momentum
• decrease because of conservation of mechanical energy
• remain the same because the raindrops are falling perpendicular to the direction of the cart's motion

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A student obtains data on the magnitude of force applied to an object as a function of time and displays the data on the graph shown. The increase in the momentum of the object between t=0 s and t=4 s is most nearly

• 40 N·s
• 50 N·s
• 60 N·s
• 80 N·s

Tags

NGSS.HS-PS2-1

The two blocks of masses M and 2M shown above initially travel at the same speed v but in opposite directions. They collide and stick together. How much mechanical energy is lost to other forms of energy during the collision?

• 1/2 M v²
• 3/4 M v²
• 4/3 M v²
• 3/2 M v²

Tags

NGSS.HS-PS2-2

The graph shows the force on an object of mass M as a function of time. For the time interval 0 to 4 s, the total change in the momentum of the object is

• 40 kg m/s 
• 20 kg m/s
• 0 kg m/s 
• – 20 kg m/s

Tags

NGSS.HS-PS2-1