Work and Energy Quiz

What is the relationship between work and energy in a system?

• Work is always equal to energy.

• Work can add or remove energy from a system.

• Work is unrelated to energy.

• Work only adds energy to a system.

Which formula is used to calculate potential energy?

• F * d

• mv^2

• mgh

• 1/2 mv^2

In the first problem, why is the initial kinetic energy of the car zero?

• The car is accelerating.

• The car is moving at a constant speed.

• The car is decelerating.

• The car is at rest.

What is the velocity of the car at the bottom of the hill in the first problem?

• 16 m/s

• 10 m/s

• 12 m/s

• 14 m/s

How does friction affect the energy of a system?

• Friction doubles the energy of the system.

• Friction removes energy from the system.

• Friction has no effect on energy.

• Friction adds energy to the system.

In the second problem, what is the effect of friction on the car's velocity at the bottom of the hill?

• The car's velocity becomes zero.

• The car's velocity decreases.

• The car's velocity remains the same.

• The car's velocity increases.

What is the velocity of the car at the bottom of the hill in the second problem?

• 14 m/s

• 12.3 m/s

• 10.5 m/s

• 9.27 m/s

In the third problem, what happens to the car's kinetic energy as it moves up the hill?

• It remains constant.

• It is converted into potential energy.

• It increases.

• It is lost as heat.

What is the maximum height reached by the car in the third problem?

• 20.4 m

• 15.2 m

• 18.6 m

• 22.8 m

In the absence of friction, what happens to the total mechanical energy of a system?

• It decreases.

• It remains constant.

• It becomes zero.

• It increases.