# Shared Flashcard Set

## Details

Chapters 4-5
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37
Physics
06/14/2010

Term
 formula for work
Definition
 W = Fd
Term
 mech. adv. of a wheel and axle
Definition
Term
 mech. adv. of an inclined plane
Definition
 length of incline-----------------height of incline
Term
 mech. of a lever
Definition
 Le--Lr
Term
 Lever work equation
Definition
 Le x E = Lr x R
Term
Definition
 Output force------------Input force
Term
 Efficiency formula
Definition
 output work-----------input work x 100%
Term
 In order to do work on an object...
Definition
 the force you exert must be in the same direction as the object's motion
Term
 no work without ______
Definition
 MOTION
Term
 define machine
Definition
 device that makes work easier, faster, or changes the direction of work
Term
 define machine
Definition
 device that makes work easier, faster, or changes the direction of work
Term
 input force
Definition
 the force you exert on a machine
Term
 output force
Definition
 force exerted by the machine
Term
 the output force is always ______ than the input force
Definition
 less
Term
Definition
 MA > 1
Term
Definition
 MA < 1
Term
Definition
 MA = 1
Term
Definition
 real-life MA
Term
Definition
 MA of a machine without friction
Term
 the more efficient a machine is, the ________ it is to its ideal mechanical advantage
Definition
 closer
Term
 name the six basic kinds of simple machines
Definition
 -inclined plane-wedge-screw-lever-wheel and axle-pulley
Term
 define inclined plane
Definition
 flat, slanted surface
Term
Definition
 increases distance
Term
 the longer the incline, the _____ input force you need to push or pull an object
Definition
 less
Term
 no machine is 100% _______ because of ________
Definition
 efficient, friction
Term
 define wedge
Definition
 device that is thick at one end and tapers to a thin edge at the other end
Term
Definition
 force is increased
Term
 define screw
Definition
 an inclined plane wrapped around a cylinder
Term
 example of wedge
Definition
 zipper
Term
 example of screw
Definition
 bolts, faucets, jar lids
Term
 define lever
Definition
 rigid bar that is free to pivot about a fulcrum
Term
 define fulcrum
Definition
 the fixed point that a lever pivots around
Term
 first class lever
Definition
 folcrum is between output & input
Term
 third class lever
Definition
 multiply distance
Term
 give an example of a first class lever
Definition
 scissers, pliers, seesaws
Term
 second class lever
Definition
 multiplies force
Term
 give examples of second class levers
Definition
 doors, nutcrackers, bottle openers
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