Study Guide for Simple Machines
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25 Terms
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Wedges
a pair of inclined planes wrapped around a cylinder.
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Screws
an inclined plane wrapped around a cylinder.
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Mechanical Advantage
the number of times the machine multiplies force.
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Mechanical Efficiency
work output /work input +100 (measured as percentage %)
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Mechanical Advantage
output force (N)/input force (N)
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Work
Is done when a force causes an object to move in the direction of the force
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Simple Machine Does What
make work easier; NOT LESS WORK
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Machine
a device that makes work easier by changing the size or direction of the force
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Work Input
the amount of work you put into the machine
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Work Output
the amount of work done by the machine
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Mechanical Advantage
the number of times the machine multiplies force
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Mechanical Efficiency
work output/work input +100 (measured as percentage %)
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1st Class Lever
the fulcrum is between the input force and output force
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2nd Class Lever
fulcrum at one end with input force at the other end and output force in between
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3rd Class Lever
the input force is between the fulcrum and the output force
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Pulleys
a simple machine that has a grooved wheel and a rope or cable
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Wheel and Axle
simple machine consisting of two circular objects of two different sizes.
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Incline Plane
a simple machine that is a straight slanted surface (ramp)
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Screws
an inclined plane wrapped around a cylinder
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Lever Equation
Distance from Input Force to Fulcrum/Distance from Output Force to Fulcrum
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Incline Plane Equation
Length of ramp/ Height of ramp
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Wheel and Axle Equation
Radius of the wheel / Radius of the axle
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Pulley Equation
If going down, Count # of pulleys ; If going up count the number of ropes
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Wedge Equation
Length of the wedge / the thickest part of the wedge
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Compound Machine
two or more machines combined into one
Flashcards (50)