This week i used mechanical energy when pedaling my bike up hill.

Energy is defined as the ability to do work. Their are two types of energy. One type is called potential energy. Potential energy is the energy stored in an object. An example of this is when a ball sits on a hill. Since it could move it has potential energy. The other type of energy is kinetic energy. Kinetic energy is the energy of motion. An example is when the ball does roll down the hill, its potential energy turns into kinetic energy because the ball moved.