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26 Cards in this Set
- Front
- Back
When is work done?
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Work is done when a force causes an object to move in the same direction that the force is applied.
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When you hold a book, are you doing work?
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No
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When is no work done?
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No work is done when the motion of an object is at a right angle of the applied force.
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What is the equation for work?
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Force x Distance
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What is power?
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Power is the rate at which work is being done.
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What is the equation for power?
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Work/Time
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What is input force?
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The force that you apply on a machine is the input force.
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What is output force?
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The force that the machine applies is the output force.
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What is the mechanical advantage?
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The number of times a machine increase the input force is the mechanical advantage.
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What is the equation for finding the mechanical advantage?
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Output force/Input force
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What is efficiency?
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The efficiency of a machine is the ratio of the output work to the input work.
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What is the equation for finding efficiency?
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Output work/Input work
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Machinces let you use less force over a greater _________.
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Distance
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What is the pivot point on a lever?
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Fulcrum
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What is power measured in?
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Watts
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What is work measured in?
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Joules
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What is a simple machine?
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A simple machine is a machine that does work with only one movement.
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What is a compound machine?
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A machine made up of a combination of simple machines.
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What is a inclined plane?
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An inclined plane is a flat, sloped surface.
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T or F: As the length of the inclined plane increases, the force needed is decreased.
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True
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What is the equation for finding work?
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Work/Distance
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What is a wedge?
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A wedge is an inclined plane that moves.
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What is a screw?
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A screw is an inclined plane wrapped around a cylinder or post.
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What is a lever?
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A lever is any rigid rod or plank that pivots, rotates, about a point.
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What is a wheel and axle?
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A wheel and axle is two circular objects of different diameters attached so that they rotate together.
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What is a pulley?
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A pulley consists of a grooved wheel with a rope or cable wrapped over it.
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