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Card 16
Front
P1.5 - Kinetic energy and elastic energy stores
Back
Card 17
Front
kinetic energy, Ek (J) = mass, m (kg) x speed^, v^ (m/s^)
Back
Card 18
Front
elastic potential energy, Ee = 1/2 x spring contact, k (N/m) x extention^, e^ (m^)
Back
Card 19
Front
Useful energy is energy transferred to where it is wanted in the way that it is wanted.
Back
Card 20
Front
The waste energy is dissipated (spreads out) and as a result may be stored in less useful ways.
Back
Card 21
Front
Useful energy is eventually transferred to the surroundings too eg. in tyres.
Back
Card 22
Front
Weight is measured in Newtons. When on the Earth's surface 1kg = 10N.
Back
Card 23
Front
efficiency = useful output energy transferred(J) / total input energy supplied to the device (J)
Back
Card 24
Front
Machines waste energy because of friction between their moving parts, air resistance, electrical resistance, noise.
Back
Card 25
Front
P1.8 - Electical appliances
Back
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