January exam - good flash cards
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Last updated 4:32 PM on 6/1/23
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11 Terms
1
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What units do you measure force in?
Newtons
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Define “friction”
A force that opposes motion
3
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When two surfaces rub together, friction is caused. This friction causes:
Heat
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How can friction be reduced?
By using lubricants, such as oil
5
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What is the formula that links unbalanced force, mass and acceleration?
F = ma
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How do ice particles move?
They don’t move, only vibrate
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How do water particles move?
They move and slide around each other
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How do steam particles move?
They move freely and quickly
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What happens when a liquid boils to a gas?
The particles absorb heat energy and begin to vibrate faster, increasing the separation between them
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Why does evaporation lead to cooling?
The water particles take away heat energy when the sweat turn from liquid to gas. Because of this, the original surface gets cooler.
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How does a foil sheet reduce heat loss?
The foil sheet prevents the heat particles from escaping, since there’s a surface in top of them
