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Physical Science - ch 13 PCHS
Phy. Science ch 13 PCHS
17
Science
9th Grade
10/31/2011

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Term
energy
Definition
-the ability to do work
Term
work
Definition
-the transfer of energy to a body by the application of force that causes the body to move in the direction of the force
Term
machine
Definition
-a device that can multiply and change the direction of an input force
Term
compound machine
Definition
-a scissors is an example of a ________________ ________________________
Term
power
Definition
-a quantity that measures the rate at which work is doe is called ______________________
Term
time
Definition
-power is calculated by dividing work by __________________
Term
compound machine
Definition
-a machine made up of more than one simple machine
Term
nuclear fusion
Definition
-the source of the sun's energy is ___________________
Term
potential energy
Definition
-stored energy resulting from the relative positions of objects in a system is called _______________ ______________
Term
chemical energy
Definition
-the source of energy when dynamite explodes is _____________________ energy
Term
open
Definition
-an _____________________system exchanges energy with the outside
Term
work
Definition
-a quantity that measures the effects of a force acting over a distance is called __________________.
Term
mechanical
Definition
-the energy of a moving object due to its motion is called ____________________ energy.
Term
photosynthesis
Definition
-the process that transforms light energy into chemical energy is called _______________________
Term
law of conservation of energy
Definition
-law that says that energy cannot be created or destroyed
Term
open system
Definition
-a system in which energy and matter are exchanged with the surroundings.
Term
closed system
Definition
-a system in which energy and matter are not exchanged
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