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20 Cards in this Set
- Front
- Back
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Work
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the action that results when a force causes an object to move
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Work Equations
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W = F* D
Work = Force * Distance |
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Simple Machines
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something that changes the magnitude or direction of a force, makes work easier, and/or makes work faster
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Lever
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a rigid bar that can pivot or rock back and forth
Ex: Crowbar, Rake, Wheelbarrow, Scissors, Tweezers, Nutcracker |
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Fulcrum
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the place at which the level pivots
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Effort
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the force created by the actual load
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Wheel and Axle
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a disk that rotates around a rod
Ex: Doorknob; waterwell |
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Gear
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A modified wheel and axle; wheel has "teeth" notched in it
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Pulley
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a wheel with a groove attched to an axel
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Inclined Plane
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a tilted surface that allows an object to be lifted with less effort
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Wedge
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a specific type of inclined plane that is used to sperate objects
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Screw
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a specific type of inclined plane where the inclined plane is wrapped around a cylinder
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Law of moments
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in a lever system in rotational equilibruim, the effort moment and the resistance moment are equal
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Moment
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the force applied perpendicular to the lever
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Moment arm
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(l) the distance from the fulcrum to where the force is applied
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Law of moments Equation
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W1L1=W2L2
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Efficiency
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a measure of how much of the amount of energy put in compares to what is actually able to be done
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Power
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the amount of work done (or energy provided) in a certain period of time
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Power Equation
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work/ delta time
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Efficiency Equation
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work out/ work in * 100
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