First Law: Inertia (Things stay at rest or in motion in a straight line unless a net force acts on them) Second Law: F = ma (Mass resists acceleration; force causes acceleration.) Third Law: Equal and opposite forces. (For every action there is an equal and opposite reaction.)
A bigger car needs a bigger engine to accelerate.
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A race car needs parachutes to stop.
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When you stop faster, you wear your brakes out faster.
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A car is hard to get moving. Once moving, the car is hard to stop.
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A balloon goes forward because it pushes air backward.
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We know that a table has to be pushing up on a resting book.
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A book stays on the table in the same place unless you push on it.
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In the 1960's, in preparation for the first moonshot, one task that had to be completed was working in space, in zero gravity. Astronauts found it much more difficult than they expected: everytime they tried to turn a wrench, for instance, the astronaut would be turned around the other way by the wrench. The nut on the bolt didn't move at all. Why did the astronaut move?
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To go forward on ice skates you have to push backwards with one of your skates.
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When you run and jump forward, you seem to "fly" for a short amount of time. Until gravity pulls you down, of course.
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If you wanted to keep your car as long as possible you should accelerate slowly: it puts less force on your engine.
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When you pull backwards with your paddle a canoe moves forward.
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If the sun were to disappear, the earth would go off into space in a straight line.
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When you change directions, you have to apply a force. (When going around a corner, for instance.)
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A slingshot can give 60 N of force. If a person shoots three rocks (0.25 kg, 0.4 kg, and 0.66 kg) which one will go the fastest?