AP Physics Momentum Review

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

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

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

A 2 kg object initially moving with a constant velocity is subjected to a force of magnitude F in the direction of motion. A graph of F as a function of time t is shown. What is the increase, if any, in the velocity of the object during the time the force is applied?

• 0 m/s 
• 3.0 m/s 
• 4.0 m/s 
• 6.0 m/s

Tags

NGSS.HS-PS2-1

A ball of mass m with speed v strikes a wall at an angle θ with the normal, as shown. It then rebounds with the same speed and at the same angle. The impulse delivered by the ball to the wall is

• mv sin θ
• mv cos θ
• 2mv sin θ
• 2mv cos θ

A student at rest on a frictionless frozen pond throws a 1.0 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other. Which correctly describes the situation?

• The hammer will have the momentum with the greater magnitude
• The student will have the momentum with the greater magnitude
• The hammer will have the greater kinetic energy
• The student will have the greater kinetic energy

How can a tennis ball and a bowling ball have the same momentum?

• have the same speed
• have different speeds
• one is moving backwards
• they can't

Tags

NGSS.HS-PS2-2

Momentum is a ____________________ quantity

• science
• scalar
• vector
• energy

Tags

NGSS.HS-PS2-2

Two objects of the same mass collide with each other. The second object is at rest and the first is moving at 5 m/s North before the collision. After the collision, the first mass is at rest and the second mass continues at 5 m/s North.

The type of collision represented by these two masses is

• Inelastic

• Explosive

• Elastic

• Totally Inelastic