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11 Cards in this Set
- Front
- Back
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What is 1kg in newtons |
10n |
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Define 1 joule in terms of weifht and height |
1J= lifting 1n object by 1m |
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What is useful output energy |
Useful energy transferred to device |
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What is input energy |
Energy supplied to device |
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Formula for input energy |
i.e= usefule output energy + energy wasted |
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Efficiency formula? |
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Why can no device have an efficiency of more than 100% |
You cant get more energy than what you put into the device |
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What can you do to decrease friction |
Lubricate parts of the machine |
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What can you do to decreass the resistance of wire so that the wire doesnt become hot and allows the current to flow freely |
Get a wire with lower resistance |
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What can you do to decreaae air resistance |
Air resistance opposes the object moving making the energy surrounding the object wasted Solve: become more streamlined |
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How can you decrease sound to decrease wasted energy |
Tighten loose parts to reduce vibration |
