# Shared Flashcard Set

## Details

Chapter 8: Work, Power and Simple Machines.
Physical Science
18
Science
02/28/2011

Term
 Work
Definition
 exertion or effort directed to produce or accomplish something
Term
 Joule
Definition
 the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force
Term
 Power
Definition
 ability to do or act; capability of doing or accomplishing something.
Term
 Watt
Definition
 the SI unit of power, equivalent to one joule per second and equal to the power in a circuit in which a current of one ampere flows across a potential difference of one volt
Term
 Work Input
Definition
 The work done on a machine.
Term
 work Output
Definition
 The work done by a machine.
Term
Definition
 a number that tells how many times a machine multiplys force.
Term
 Mechanical Efficiency
Definition
 A comparison of a machines work output with the work input.
Term
 Machine
Definition
 an apparatus consisting of interrelated parts with separate functions, used in the performance of some kind of work
Term
 Simple Machine
Definition
 a simple device for altering the magnitude or direction of a force. The six basic types are the lever, wheel and axle, pulley, screw, wedge, and inclined plane
Term
 Compound Machine
Definition
Term
 Lever
Definition
 a rigid bar that pivots about one point and that is used to move an object at a second point by a force applied at a third.
Term
 Fulcrum
Definition
 the support, or point of rest, on which a lever turns in moving a body.
Term
 Inclined Plane
Definition
 one of the simple machines, a plane surface inclined to the horizon, or forming with a horizontal plane any angle but a right angle.
Term
 Wedge
Definition
 a piece of hard material with two principal faces meeting in a sharply acute angle, for raising, holding, or splitting objects by applying a pounding or driving force, as from a hammer.
Term
 Screw
Definition
 a metal fastener having a tapered shank with a helical thread, and topped with a slotted head, driven into wood or the like by rotating, especially by means of a screwdriver.
Term
 Wheel and Axle
Definition
Term
 Pulley
Definition
 a wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines.
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