The work, W, done by a constant force on an object is defined as the product of the component of the force along the direction of displacement and the magnitude of the displacement.
Calculation of Work:
When calculating work, only the force that is applied in the direction of motion is considered. W=Fdcosθ
If the force and displacement are in the same direction, that would be considered positive work.
Power is a measure of how quickly work is done.
Kinetic energy is energy of motion. All moving object possess kinetic energy.
Gravitational Potential Energy:
Gravitational Potential energy is the energy an object possessed due to its position.
The point that height is measured from. Any point can be used as a base level because the energy amount you calculate will be relative.
Conservation of Energy:
Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes.