AP Physics Energy

A 2 kg ball is attached to a 0.80 m string and whirled in a horizontal circle at a constant speed of 6 m/s. The work done on the ball during each revolution is...

• zero

• 16 J

• 72 J

• 90 J

If L, M, and T denote the dimensions of length, mass, and time, respectively, what are the dimensions of power?

• L²M/T²

• M²L/T²

• M²L/T³

• ML²/T³

A man stands in an elevator as it begins to ascend. Does the normal force from the floor do work on the man?

• Yes, and the work done will be positive.

• Yes, and the work done will be negative.

• Yes, but the sign can’t be determined.

• No.

Tags

NGSS.HS-PS2-1

What unit do we use for measuring power?

• Watts 

• Joules 

• Newtons 

• ft/lbs

By what factor will the kinetic energy of an object increase if the velocity of the object is tripled?

• The kinetic energy will stay the same.

• 3

• 6

• 9

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

A rocket of mass m begins to ascend vertically at v m/s. The work that gravity does on the rocket is:

• Negative

• Zero

• Positive

• Undefined

Tags

NGSS.HS-PS2-4

An 8-kg object is raised by a crane to the top of a building 20-meters in height. If it takes 50 seconds for the object to get to the top of the building, then how much power was needed?

• 1600 watts

• 3.2 watts

• 32 watts

• 200 watts

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A kg-m²/s² is otherwise known as a(n)

• Newton

• Joule

• Watt

• Displacement

Which unit of the AP Physics Exam is weighted at 20-28% (highest)?

• Kinematics

• Energy

• Momentum

• Dynamics

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

A child slides from rest down slides A and B shown above. The slides are the same height, and the coefficient of friction between the slides and the child is the same. Which of the following compares the change ΔK in the kinetic energy of the child and the change ΔU in the potential energy of the child-Earth system for the two slides?

• ΔK_A = ΔK_B; ΔU_A = ΔU_B

• ΔK_A < ΔK_B; ΔU_A > ΔU_B

• ΔK_A > ΔK_B; ΔU_A = ΔU_B

• ΔK_A > ΔK_B; ΔU_A > ΔU_B

Tags

NGSS.HS-PS3-1