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DES Unit 1 Forces & Motions
Forces
11
Science
4th Grade
10/22/2007

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Term
position
Definition
A certain place
Term
motion
Definition
A change of positon
Term
frame of reference
Definition
The thinkgs around you that you can sense & use to describe motion
Term
relative motion
Definition
A motion that is described based on a frame of reference
Term
speed
Definition
A measure of an object's change on position during a unit of time
Term
force
Definition
A push or pull
Term
newton
Definition
The metric unit or Systeme International (SI) unit of force
Term
acceleration
Definition
A change in the speed or dircetion of an object's motion
Term
gravity
Definition
A force that pulls all objects toward each other
Term
weight
Definition
A measure of the force of gravity upon on object
Term
friction
Definition
A force that keeps objects that are touching each other from sliding past each other easily
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