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12 Cards in this Set
- Front
- Back
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What does work mean in our every day lives? |
Using energy Or doing a job for money |
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What is the unit of power |
Watts (W) |
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What is the unit of work |
Joules (J) |
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What is the formula for power |
P= Work/ Time |
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what is the formula for work? |
W= Force * Distance |
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A Girl tries to move a 500 Lbs. box across the floor, the box doesn't move one inch is she doing work? Why |
No work is being done. if the box does not move then there is no work being made |
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What is potential energy |
PE= energy due to height or stored energy |
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What is kinetic energy |
KE= energy due to movement |
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Most simple machines ( Increase/ Decrease) the distance to (Increase / decrease) the force needed todo the work |
1. increase 2. decrease |
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How do you get a better mechanical advantage with a pulley (block and tackle) system? what is the trade off? |
Increase the number of pulleys! It is easier to lift a heavy object ( less force) but you-need more string and the system is more complicated. |
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How do you get a better mechanical advantage with a lever? |
Increase the length of the lever when you do this you can use less force to move a heavy object. |
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Most simple machine ( Increase/ decrease) the distance to ( increase / decrease ) the force needed todo the work |
1. Increase 2. decrease |
