CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

When can one use the work energy theorem?


Open in App
Solution

Work-Energy Theorem:

  1. According to the work-energy theorem, the work done on a body by a net force is equal to the change in kinetic energy.
  2. Kinetic energy is the energy that an item or particle has as a result of its movement.

Mathematically, the work-energy theorem can be represented as:

KfKi=W

Here,

Kf is the final kinetic energy.

Ki is the initial kinetic energy.

W is the net work done.

According to the Work energy theorem,

Work done by all the forces = Change in Kinetic Energy

Wg+WN+Wf=KfKi

Here,

Wg is the work done by gravity.

WN is the work done by a normal force.

Wfis the work done by friction.

Kfis the final kinetic energy.

Ki is the initial kinetic energy.

Use of Work-Energy Theorem:

  1. When the motion of an item is known but the values of one or more of the forces acting on it are unknown, the work-energy theorem may be able to provide some insight into the forces.
  2. For both constant and variable forces, the work-energy theorem holds true.

flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Kinetic Energy and Work Energy Theorem
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon