Work, Energy & Power
Work done is the amount of energy transferred from one form to another when a force causes movement.
The units of work are Joules, J
W = Fx Work Done = Force × distance moved (in the same direction as the force)
When the force is not in the same direction as the movement of the object, you need to work out the correct component force using trigonometry.
You must remember to do this!
One of the fundamental laws of physics is the idea that energy cannot be created. This is known as the Principle of Conservation of Energy and states:
The total energy in a closed system always remains constant - energy can never be created or destroyed, it can only ever be transferred from one form to another.
Some of these forms include:
All moving objects have kinetic energy:
KE = 1/2 m v^2 Kinetic Energy = 1/2 x mass x velocity squared
This equation can be derived easily from work done and SUVAT: