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Card 16

Front

P1.5 - Kinetic energy and elastic energy stores

Back

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Card 17

Front

kinetic energy, Ek (J) = mass, m (kg) x speed^, v^ (m/s^)

Back

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Card 18

Front

elastic potential energy, Ee = 1/2 x spring contact, k (N/m) x extention^, e^ (m^)

Back

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Card 19

Front

Useful energy is energy transferred to where it is wanted in the way that it is wanted.

Back

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Card 20

Front

The waste energy is dissipated (spreads out) and as a result may be stored in less useful ways.

Back

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Card 21

Front

Useful energy is eventually transferred to the surroundings too eg. in tyres.

Back

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Card 22

Front

Weight is measured in Newtons. When on the Earth's surface 1kg = 10N.

Back

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Card 23

Front

efficiency = useful output energy transferred(J) / total input energy supplied to the device (J)

Back

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Card 24

Front

Machines waste energy because of friction between their moving parts, air resistance, electrical resistance, noise.

Back

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Card 25

Front

P1.8 - Electical appliances

Back

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