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22 Cards in this Set
- Front
- Back
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definition of work
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to apple a force to the object while the object moves a distance in the direction of the force.
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throwing a basketball from one person to another
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yeah
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pushing on a box, but the box doesn't move
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no
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holding a box over your head
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no
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walking to class, holding your books
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no
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definition of simple machines
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they help people do work and they don't need a motor
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how do u calulate work
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force * distance
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what's the unit for work?
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joule
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definition of power
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how fast you do work
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what's the unit for power?
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watt
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definition of Mecanical Advantage
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tells you how many times a machine multiplies force
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how to calculate mechanical Advantage
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by dividing output by input force
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the ______ the mechanical advantage the ______ a machine makes your work.
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larger, easier
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definition of Mechanical Efficiency
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a comparison-expressed as a percentage-of a machine's work output with the work in put
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how 2 calculate Mechanical efficiency
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dividing work output by work input then multiply it by 100
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some of the ____ done by a machine is used to ________ ________ created be a machine
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work, overcome, friction
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definition of inclined plane
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a simple machine that is a straight slanted surface: a ramp
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definition of lever
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a simple machine consisting of a bar that pivots at a fixed point, called a fulcrum; there are three classes of levers, based on where the input force, output force, and fulcrum are placed in relation to the load; first class levers, second class levers, and third class levers
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definition of pulley
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a simple machine consisting of a grooved wheel that holds a rope or a cable
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definition of wedge
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a simple machine that is a double inclined plane that moves; a wedge is often used for cutting
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definition of wheel and axle
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a simple amchine consisting of two circular objects of different sizes
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definition of screw
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a simple machine that is an inclined plane wrapped in a spiral
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