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12 cards from this deck
Heat moving from a warm place to a cooler place
Faster heat transfer
Slower heat transfer
How good a material is at letting heat pass through it
Good conductor of heat (e.g., metals)
Poor conductor of heat (e.g., plastic, wood)
How good a device is at transferring energy into useful forms
Less than 100% (no machine is 100% efficient)
useful energytotal energy×100%\frac{\text{useful energy}}{\text{total energy}} \times 100\%total energyuseful energy×100%
No units (given as a percentage)
Reducing friction
Air resistance
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