Push against a door that does not move. Describe the mechanical energy

Work done on the door is = 0

Mechanical energy of the person is 100%

Mechanical energy of the door is 50%.

Explanation:

Mechanical energy, M. E., is the energy an object possesses due to its position and motion. When we talk of position, the body is at rest = potential energy. In terms of motion, the body is moving = kinetic energy.

This means that M. E = potential + kinetic

Also, Work done = force * distance

For the person pushing the door, the potential of the energy stored in the person and the kinetics of pushing the door handle are all present. Therefore, M. E of person is 100%.

But despite the doors potential energy present, there is no motion from it, which means the M. E is only half or 50%.

Also, since distance moved by the door is 0, no work is done on the door.