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Force and Motion Unit 2
Force A push or a pull
Inclined plane A simple machine that is a flat surface with one end higher than the other
Speed The distance an object moves in a given amount of time
Motion A change in the position of an object as it is moving
Friction A force that slows down a moving object when it rubs against another object
Magnet An object that pulls objects made from iron toward it
Pole One of the two ends of a magnet where the pull is the strongest
Attract To pull toward- unlike poles on a magnet attract each other
Repel To push away-like poles on a magnet repel each other
Magnetic Field All of the invisible magnetic forces around a magnet
Gravity A force that attracts objects to each other. The force of gravity holds you to Earth.
Simple Machine A machine that makes work easierHas few or no moving parts
Wedge A simple machine made of two inclined planes joined togetherExample: an ax
Lever A simple machine made of a bar that moves on a fixed pointExample: a crowbar
Pulley A simple machine made up of a wheel with a rope around itLifts heavy objects
Wheel and Axle A simple machine made up of a wheel with a rod going through the center Example: skates, cars
Screw A simple machine with ridges or threads that wrap around a rodExamples: a drill
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