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ch 8 PS HRW
Chapter 8 PS HRW
16
Physics
8th Grade
08/22/2007

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Term
compound machine
Definition
a device that combines two or more simple machines.
Term
mechanical efficiency
Definition
the ratio of the output to input of energy or of power; it can be calculated by dividing work output by work input
Term
inclined plane
Definition
a flat surface with one end higher than the other
Term
joule
Definition
a unit of work equal to one newton-meter
Term
lever
Definition
a rigid object that pivots about a fixed point
Term
machine
Definition
a device that changes the amount of force exerted or the direction in which force is exerted
Term
mechanical advantage
Definition
the number of times the force exerted on a machine multiplied by the machine
Term
pulley
Definition
a grooved wheel around which is wrapped a rope chain or cable
Term
screw
Definition
an include plane wrapped around a central cylinder to form a spiral
Term
wedge
Definition
an included plan that moves
Term
wheel and axle
Definition
two circular or cylindrical object that are fastened together and rotate about a common axis
Term
work
Definition
the transfer of energy to a body by the application of a force that causes an object to move in the direction of the force
Term
power
Definition
a quantity that measures the rate at which work is done or energy is transferred
Term
watt
Definition
the unit used to express power; equivalent to a joule per second
Term
work input
Definition
the work done on a machine
Term
work output
Definition
the work done by a machine
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