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12 Cards in this Set
- Front
- Back
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Gravitational potential energy (GPE):
1) Is energy due to? 2) It changes as? |
1) Gravity.
2) The distance between the object and the centre of the earth changes. |
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Change in GPE:
1) GPE remains effectively constant when? 2) As GPE remains constant? |
1) The change in distance between the object and the centre of the earth is less than that of the earths radius.
(Approx. 6371km)
2) So does gravitational acceleration. |
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From knowing gravitation acceleration remains constant:
1) What is its value? |
1) 9.81 m s⁻². |
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Formula for GPE (or EP in general): |
Ep = mgh
- Ep → potential energy → J - m → mass → kg - g → gravitational acc. → 9.81m s⁻² - h → height → m |
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Gravitational acceleration:
1) As distance from centre of earth increases?
2) However? |
1) Becomes smaller.
2) The change is negligible if the change distance is smaller than the earths radius. |
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Front (Term) |
Back (Definition) |
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When determining our height in 'mgh':
1) Initial height? |
1) We often decide where our h0 will be based upon the question.
E.g. h0 may be the floor, or it could be in the air where something was dropped... |
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When determining our height in 'mgh':
1) Initial height? |
1) We often decide where our h0 will be based upon the question.
E.g. h0 may be the floor, or it could be in the air where something was dropped... |
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Values for Ep:
1) Ep = 0? 2) Ep < 0? 3) Ep > 0? |
1) There is no potential energy.
2) Can be negative, we just use the magnitude anyway. The sign depends on where our h0 was defined.
3) The amount of potential energy. |
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When determining our height in 'mgh':
1) Initial height? |
1) We often decide where our h0 will be based upon the question.
E.g. h0 may be the floor, or it could be in the air where something was dropped... |
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Values for Ep:
1) Ep = 0? 2) Ep 3) Ep > 0? |
1) There is no potential energy.
2) Can be negative, we just use the magnitude anyway. The sign depends on where our h0 was defined.
3) The amount of potential energy. |
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Change in Ep:
1) ΔEp < 0? 2) ΔEp = 0? 3) ΔEp < 0? |
1) Decreasing.
2) Constant.
3) Increasing. |
