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|What is the law of conservation of energy?
|Energy cannot be created or destroyed, only transferred.
|What is useful energy?
|Useful energy is energy that is transferred to where it is wanted, in the form that it is wanted in.
|What is the equation for efficiency?
|Efficiency = Useful energy/Total Energy Input x 100%
|Name 4 ways that a machine can waste energy
|Friction creates heat, air resistance causes energy transfer to the surroundings, resistance of a wire causes heat, sound created by machinery.
|Name 9 types of energy
|Electrical, Chemical, Sound, Heat, Nuclear, Gravitational Potential, Elastic Potential, Kinetic, Light