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Forces & Motion
Unit 3
11
Science
3rd Grade
09/21/2008

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Cards

Term
Force  
Definition
A push or a pull
Term

Motion  

 

Definition
A change in position
Term
Force
Definition
What every motion is started with.
Term
Speed        
Definition
The measure of how fast something moves over a certain distance.
Term
Gravity     
Definition
The force that pulls objects toward each other.
Term
Weight
Definition
A measure of the pull of gravity on an object.
Term
Work
Definition
The measure of force it takes to move an object a certain distance. 
Term
Simple machine  
Definition
A tool that helps people do work. 
Term
What are the six simple machines?
Definition
lever, pulley, wheel & axle, inclined plane, wedge and screw.
Term
Lever
Definition
A bar that moves on or around a fixed point.
Term
Inclined Plane
Definition
A flat surface set at an angle to another surface.
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