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6 Cards in this Set
- Front
- Back
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energy |
- capacity to do work - scalar quantity - SI unit: joules (J) |
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mechanical energy |
- sum of kinetic energy & graitational potential energy - kinetic energy = 1/2 X mass X (volume)^2 - gravitational potential energy = mass X height X gravitational field |
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conservation of energy |
- neither creater nor destroyed - changed from on form to another - transferred from one body to another - total amount of energy remains constant |
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work done |
only done when object moves in direction of force applied
w.d = force X speed |
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power |
- rate of work done - rate of energy converted - scalar quantity - SI unit: watts (W)
power = w.d/time power = sum of energy/time |
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efficiency |
how much energy is used effectively
efficiency = useful energy output/total energy input X 100% |
