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Chapter 8, Lesson 1 and 2


push or pull


caused by a force


applying a force to move an object through a distance


the force that does work


the force that pulls all things toward the center of the earth


a force that resists motion between two things that rub against each other, makes objects stop


causes all matter that is moving to stay in motion, causes all matter that is not moving to say at rest unless a force acts on it


object moved by the effort

simple machines

used to make work easier, reduces the amount of effort needed

amount of work

depends on the amount of force and the distance moved

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