: Energy is measured in Joules, 1kJ is equal to 1000J, Food is a source of chemical energy, Efficiency is a measure of how well an object turns energy input into useful energy output, An object which is up high has gravitational potential energy , Kinetic energy is movement energy, Kinetic energy depends on mass and velocity, GPE depends on mass , Ek = 0.5 x m x V2, Ep=mgh, : Gravitational energy is due to an object being squashed or stretched, An object has energy in its thermal store when it is up high, Energy can be destroyed, Energy can be created, Mass and weight are the same thing, Kinetic energy is affected by height , GPE depends on velocity, KE and GPE at the same thing, Ek = 2 x h x V2, Ep = 0.5mgh,

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