3.3
Help!
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| there are a total of 3 types of simple machines | false
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| the forearm of the human body works like a third-class lever | true
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| there are four types of classes of levers | false
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| which factors determine whether a lever is a first class lever, second class lever, or third class lever | the input forces, output forces and the fulcrum
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| what is a compound machine | when two or more machines work together
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| how do you calculate efficiency of a compound machine | divide
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| how can you use a wedge | door stop, axe, and eating food
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| how can you use a lever | your arm, your neck, and your foot
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| how can you use a pulley | lift an engine, open your window blinds, and an elevator
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| flagpole | pulley
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| roller skates | wheel and axle
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| sailboat mast | pulley
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| a lever pivot point | fulcrum
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| an oar | first-class lever
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| a hockey stick | third-class lever
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| how can gears change there size and direction | they go opposite directions
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| what happens to efficiency of the overall machine as more simple machines are added to it | the efficiency decreases
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