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Ch 8 vocab
Ch 8 vocab
14
Physics
8th Grade
01/04/2008

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Cards

Term
Work
Definition
Occurs when a force causes an object to move in the direction of the force.
Term
Joule
Definition
A unit used to measure work
Term
power a rate in which work is done
Definition
watt joules per second
Term
machine
Definition
A device that helps make work easier
Term
work input
Definition
aplying force
Term
work output
Definition
mechanical advantage tells how many times the machine multiplies force 
Term
Mechanical efficiency
Definition
a comparission of a machines work input
Term
Lever
Definition
a bar that pivots at a fixed point
Term
inclined plane
Definition
a simple machine that is a striaght slanted surface
Term
wedge
Definition
a double inclined plane that that moves
Term
screw
Definition
incline plaine wrapped in a spiral
Term
wheel and axle
Definition
a simple machine consisting of two circular objects
Term
pulley
Definition
a simple machine consisting of a grovved wheel thaty holds a rope or cable
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