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Simple Machines
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Machines reduce the amount of ____ needed to carry out a task.
effort
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a ____ has a fixed support point or culcrum and a rigid bar.
lever
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A ______ is a machine that uses wheels to lift an object.
pulley
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The contact between the object and the ground creates a force called _____.
friction
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A wheel has a circular part with a long rod or ____ going through the middle of it.
axle
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Because of the position of the ______, the force is increased.
fulcrum
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The ____ is the most important and earliest human invention.
wheel
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Friction forces work in the _____ direction of the movement.
opposite
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Wheels and rollers turn easily and reduce the friction with the _____.
ground
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a force _______ on one end of the bar is transferred to the other end.
downward
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Machines give us a mechanical _______ because they reduce the amount of effort needed to carry out a task.
advantage
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an ______ _____ is a type of simple machine. It needs less effort to push a heavy object up a slope.
inclined plane
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The most basic circular tool is a _______.
roller
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