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Lesson: Gravitational Potential Energy

Worksheet: Gravitational Potential Energy • 5 Questions

Q1:

How much work is done against the gravitational force on a 5.00-kg briefcase when it is carried from the ground floor to the roof of the Empire State Building, a vertical climb of 380 m?

Q2:

Find the change in energy of a payload of mass kg taken from rest at the surface of Earth and placed at rest on the surface of the Moon, assuming that all the kinetic energy involved in moving the payload could be recovered. Use a value of kg for the mass of the Earth and a value of kg for the mass of the Moon. use a value of m for the radius of the Earth and a value of m for the radius of the Moon, and use a value of m for the distance between the center of mass of the Earth and the center of mass of the Moon.

  • A J
  • B J
  • C J
  • D J
  • E J

Q3:

A cat’s crinkle ball toy of mass of 15 g is thrown straight up with an initial speed of 3.0 m/s. Assume in this problem that air drag is negligible.

What is the kinetic energy of the ball as it leaves the hand?

How much work is done by the gravitational force during the ball’s rise to its peak?

What is the change in the gravitational potential energy of the ball during the rise to its peak?

If the gravitational potential energy is taken to be zero at the point where the ball leaves the hand, what is the gravitational potential energy when it reaches the maximum height?

If the gravitational potential energy is taken to be zero at the maximum height the ball reaches, what would the gravitational potential energy be when it leaves the hand?

What is the maximum height the ball reaches?

Q4:

A person of mass 62.0 kg climbs stairs, moving 1.14 m vertically upward. Find the work done by the person.

Q5:

An elevator car of mass kg is pulled 40.0 m vertically upward at constant speed by its cable. An average friction force of 100 N resists the motion of the elevator car.

What work is done on the elevator car by the cable?

What work is done on the elevator car by the force of gravity?

What is the total work done on the elevator car?

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