energy transfer

The law of conservation of energy

When there are energy transfers in a closed system there is no net change to the total energy in that system. This means energy cannot be created or destroyed and can only be transferred from one to another

Efficency

Useful energy transfered/total energy supplied

How to increase the efficiency?

Lubricate moving parts with oil, increase thickness of thermal insulation or use a material with lower Rheal conductivity

Work done (J)

Distance moved in direction of force (m) x force (N)

Power (W)

Work done (E)/ time taken (s)

Gravitational potential energy

Weight x height (m)

Weight

Mass (kg) x gravitational field strength (N/kg)

Kinetic energy

½ x mass (kg) x velocity² (m/s)