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Chapter 9
Work, Power, and Simple Machines
9
Science
10th Grade
02/04/2008

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Term
work
Definition
quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force
Term
power
Definition
a quantity that measures the rate at which work is done
Term
mechanical advantage
Definition
a quantity that measures how much a machine multiplies force or distance
Term
simple machines
Definition
one of the six basic types of machines of which all other machines are composed
Term
compound machine
Definition
a machine made of more than one simple machine
Term
potential energy
Definition
the stored energy resulting from the relative positions of objects in a system
Term
kinetic energy
Definition
the energy of a moving object due to its motion
Term
mechanical energy
Definition

the sum of the kinetic and potential energy of large-scale objects in a system

Term
efficiency
Definition
a quantity, usually expressed as a percentage, that measures the ratio of useful work output to work input
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