If a World Civilization book is lifted to the top shelf of a student locker, then the student supplies the force to do the work on the book. A moving car possesses mechanical energy due to its motion kinetic energy. Once more, mechanical energy is the ability to do work.
Halfway down it will have half kinetic energy and half potential energy. To drive a nail into the piece of wood which is workhe has to lift the iron hammer up, this increases its potential energy because if its high position.
As the pendulum moves, energy is continuously passing back and forth between the two forms. Usually, the mechanical energy before the collision is greater than the mechanical energy after the collision. The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy.
Power In a previous part of Lesson 1it was said that work is done upon an object whenever a force acts upon it to cause it to be displaced. A barbell lifted high above a weightlifter's head possesses mechanical energy due to its vertical position above the ground gravitational potential energy.
There are conditions under which the total mechanical energy will be a constant value and conditions under which it will be a changing value.
The mechanical energy of the compressed springs gives the springs the ability to apply a force to the dart in order to cause it to be displaced.