โš›๏ธ Physics Quiz 5: Work, Energy, and Power

โš›๏ธ Physics ยท Quiz 005

Use work and energy ideas to connect kinetic and potential energy, conservation of mechanical energy, and power.

Learning goalIntroduce energy as an alternative framework for analyzing motion and connect work, kinetic energy, potential energy, conservation, and power.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationWhat is the translational kinetic energy of a nonrelativistic object of mass m moving with speed v?
Need a small nudge?

Recall the standard nonrelativistic expression that depends on mass and the square of speed.

UnderstandingA constant force acts exactly perpendicular to an object's displacement. What work does that force do on the object?
Need a small nudge?

Use the angle between the force and displacement in the mechanical-work expression.

ApplicationNear Earth's surface, how much does gravitational potential energy increase when a 2.0 kg object is lifted vertically by 5.0 m? Use g = 9.8 m/s^2.
Need a small nudge?

Near Earth's surface, use the change in height with mgh.

InterpretationNear Earth's surface, a cart starts from rest at a height of 20 m on a frictionless track and descends to a point where the reference gravitational potential energy is zero. What is its speed there? Use g = 9.8 m/s^2.
Need a small nudge?

With no friction, compare the initial gravitational potential energy with the final kinetic energy.

ConnectionA lift raises a 200 kg load vertically by 5.0 m at constant speed in 10 s. Ignoring losses, what work does the lift do against gravity and what average power is required? Use g = 9.8 m/s^2.
Need a small nudge?

Calculate the energy transferred against gravity first, then divide by the elapsed time.

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