Shared Flashcard Set

Details

Ch.8
Work and Machine
18
Science
8th Grade
02/28/2011

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Cards

Term
Work
Definition
The action that results when a force causes an object to move in the direction of force
Term
Joule
Definition
The unit used to express work and energy
Term
Power
Definition
The rate at which work is done
Term
Watt
Definition
The unit used to express power
Term
Work input
Definition
The work done on a machine
Term
work output
Definition
The work done by a machine
Term
Mechanical Advantage
Definition
A number that tells how many a machine multiplies force
Term
Mechanical Efficiency
Definition
A comparison expressed as a percentage of a machine's work output with the work input
Term
Machine
Definition
A device that helps make work easier by changing the size or direction of the force
Term
Simple Machine
Definition
The six machines from which all other machines are constructed
Term
Compound Machine
Definition
A machine that is made of two or more simple machines
Term
Lever
Definition
A simple machine consisting of a bar that pivots at a fixed point called a fulcrum
Term
Fulcrum
Definition
The fixed point about which a lever pivots
Term
Inclined Plane
Definition
A simple machine that is a straight,slanted surface; a ramp
Term
Wedge
Definition
A simple machine that is a double inclined plane that moves
Term
Screw
Definition
A simple machine that is an inclined plane wrapped in a spirl
Term
Wheel and Axle
Definition
A simple machine consisting of two circular objects of different sizes
Term
Pulley
Definition
A simple machine consisting of a grooved wheel that holds a rope or a cable
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