Physics Work Energy Theorem Examples

This physics video tutorial provides a basic introduction into the work energy theorem also known as the work energy principle.

Physics work energy theorem examples.

A bicycle or skateboard in motion possesses kinetic energy. Here are some kinetic energy examples. W n work done by a normal. The quantity 1 2 m v 2 in the work energy theorem is defined to be the translational kinetic energy ke of a mass m moving at a speed v.

Work energy theorem the net work on a system equals the change in the quantity 1 2 m v 2. Therefore the change in the car s kinetic energy is equal to the work done by the frictional force of the car s brakes. Also here the work done is the work done by all forces acting on the body like gravity friction external force etc. General derivation of the work energy theorem for a particle.

The work energy theorem is useful however for solving problems in which the net work is done on a particle by external forces is easily computed and in which we are interested in finding the particles speed at certain positions of even more significance is the work energy theorem as a starting point for a broad generalization of the concept. The principle of work and kinetic energy also known as the work energy theorem states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. 5 work energy theorem. When you are walking or running your body is exhibiting kinetic energy.

In physics work is the process of energy transfer to the motion of an object via application of a force. W g w n w f k f k i. This definition can be extended to rigid bodies by defining the work of the torque and rotational kinetic energy. 7 2 5 w n e t 1 2 m v 2 1 2 m v 0 2.

Where w g work done by gravity. The relationship between work and kinetic energy of the object is called the work energy theorem. Translational kinetic energy is distinct from rotational kinetic energy which is considered later. We have already discussed about work done on the object and kinetic energy.

We apply the work energy theorem. For example consider the following figure according to work energy theorem work done by all the forces change in kinetic energy. Examples of forces that have potential energies are gravity and spring forces. It states that the net work d.

Therefore we first need to determine the car s kinetic energy at the moment of braking using. The quantity 1 2mv2 1 2 m v 2 in the work energy theorem is defined to be the translational kinetic energy ke of a mass m moving at a speed v.