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10 Cards in this Set
- Front
- Back
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What is the name of the energy stored by a moving object? |
Kinetic energy |
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Where might elastic potential energy be stored? |
In a stretched catapult |
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What is the main energy transfer for an apple falling from a tree? |
Gravitational potential energy———> kinetic energy |
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What is the main energy transfer for a long-distance runner? |
Chemical energy———>Kinetic energy |
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Which energy cannot happen to energy? |
Energy cannot be created |
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If 4,000 J of energy is transferred and 2,500 J is usefully stored, how much energy is wasted? |
1500J |
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What happens to 'dissipated' energy? |
It spread out into the surrounding |
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What is the gravitational potential energy stored in a 60 kg child sitting at the top of a 2 m high slide? (g = 10 N/kg) |
600J |
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The spring constant of a spring is 25 N/m. The spring is extended by 50 cm. How much elastic potential energy is stored? |
50 cm = 0.5 m. ePe = ½ k e2 = ½ × 25 × 0.52 = 3.125 J |
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A 4 kg ball has 50 J of kinetic energy. How fast is it moving? - Higher |
KE = ½ m v2, 50 = ½ × 4 × v2, 25 = v2, v = 5 m/s |
