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2 November, 03:12

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

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  1. 2 November, 03:56
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    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.
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