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8 Cards in this Set
- Front
- Back
- 3rd side (hint)
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When an object has a force exerted on it:
1) What occurs? |
1) Energy transfer from work. |
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Work done:
1) Has the symbol? 2) Units? |
1) W. 2) Joule (J). |
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The value for 'W':
1) Depends on three things? |
1) The force exerted. 2) The distance moved (displacement). 3) The direction of motion. |
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With regards to the direction of motion:
1) We only need to consider it when? |
1) The force is parallel to the direction of motion.
2) This can be in the same direction as the notion, or directly opposite. |
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When the force is in the same direction as the motion:
1) Value for W? 2) The transfer of energy is? |
1) W > 0.
2) Energy is transferred TO the object. |
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When the force is opposite to the direction of the motion:
1) Value for W? 2) The transfer of energy is? |
1) W
2) Energy is transferred FROM the object. |
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The formula for 'work': |
W = FΔx.
- W = Work done = Joule (J) - F = Force = Newtons (N) - Δx = Change in distance (displacement) = metres (m) |
For this formula we need a constant force. |
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When calculating 'W' with a non-constant force:
1) We use? 2) This is denoted by?
- We could use instead? |
1) An average force. 2) We write a – on top of the symbol.
- For the average force, we could use the area under a graph of F as a function of x. |
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