s8p3.a () s8p3.b () s8p3.c
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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work | the transfer of energy to an object by using a force that causes the object to move in the direction of the force
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machine | a device that helps do work either by overcoming a force or changing the direction of the applied force
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inclined plane | a simple machine that is a straight, slanted surface, which facilitates the raising of loads; a ramp
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wedge | a simple machine that is made up of two inclined planes and that move; often used for cutting
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screw | a simple machine that consists of an inclined plane wrapped around a cylinder
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lever | a simple machine that consists of a bar that pivots at a fixed point called a fulcrum
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pulley | a simple machine that consists of a wheel over which a rope, chair, or wire passes
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wheel and axle | a simple machine consisting of 2 circular objects of different sizes; the wheel is the large of the 2 circular objects
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force | a push or pull exerted on an object in order to change the motion of the object ; force has size and direction
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motion | an objects change in position relative to a reference point
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reference point | a stationary object that is used to describe an object's motion
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speed | the distance traveled divided by the time interval during which the motion occurred
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velocity | the speed of an object in a particular motion
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acceleration | the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
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friction | a force that oppose motion between 2 surfaces that are in contact
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net force | the combination of all the forces acting on an object
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balanced force | stated when the net forces acting on an object equal zero
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unbalanced force | stated when the net force acting on an object is not zero
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inertia | the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object
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gravity | a force of attraction between objects that is due to their masses
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Created by:
32geokes
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