Kinetic Energy : = 0.5 x mass x speed2, energy to do with moving objects , A book falls from a high shelf. How much energy does it have just before it hits you?, Gravitational potential energy : = mass x gravitational field strength x height , energy to do with objects at a height, A book is lifted onto a shelf. How much extra energy is stored in the book?, Elastic potential energy : = 0.5 x spring constant x extension2, energy to do with elastic objects , A book falls onto your trampoline hat. How much energy is stored in the trampoline?,

Energy changes

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