AP Physics AP Physics Fluid Mechanics & Energy Systems 2

Question 1

The work-energy theorem states that the net work done on an object equals:

Accepted Answer

Its change in kinetic energy

Answer

The work-energy theorem states W_net = ΔKE, the net work equals the change in kinetic energy.

Question 2

A 2 kg object is lifted 5 m. How much gravitational potential energy is gained? (g = 10 m/s²)

Accepted Answer

100 J

Answer

ΔPE = mgh = 2 × 10 × 5 = 100 J.

Question 3

In a conservative system, as an object falls and speeds up, mechanical energy:

Accepted Answer

Is converted from potential to kinetic

Answer

In a conservative system, total mechanical energy is conserved; potential energy converts to kinetic energy as the object falls.

Question 4

A spring with spring constant k = 200 N/m is compressed 0.1 m. What is the elastic potential energy stored?

Accepted Answer

1 J

Answer

Elastic PE = (1/2)kx² = (1/2)(200)(0.1)² = 1 J.

Question 5

Power is defined as:

Accepted Answer

Work divided by time

Answer

Power P = W/t, the rate at which work is done or energy is transferred.

AP Practice Test