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Forces and Motion
Forces



Forces
Reading Level
     edHelper's suggested reading level:   grades 5 to 8
     Flesch-Kincaid grade level:   4.25

Vocabulary
     challenging words:    magnitude, acceleration, negative, force, exert, mass, downward, scientist, equal, gravity, attraction, earth, certain, cause, amount, since
     content words:    Isaac Newton


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Forces
By Cindy Grigg
  

1     What is a force? A force is a push or a pull. Forces are acting all around you. Forces are even acting on you! Objects (and you) are being pushed and pulled in different directions. Sometimes the force can be seen, like when you push a toy car or throw a ball. Sometimes you don't see forces at all. Even objects that are not moving have forces acting on them. Forces have the ability to cause change.
 
2     Forces always come in pairs. Objects exert forces on each other. When you run into something, let's say another person, you exert a force on that person. He may fall down if the force is strong enough. But that other person also exerts a force on you. You might also fall down. You can see movement caused by the force. If you run into a wall, you might not see any movement. The wall doesn't move. You probably wouldn't fall down. But it might hurt. You pushed on the wall, or exerted a force on the wall. The wall exerted a force back on you. It hurts the part of your body that hit the wall because the wall exerted a force on your body.
 
3     The strength of the force is called the magnitude of the force. Forces also have a certain direction. For example, when you are standing, you exert a force on the ground that is equal to your weight. Your body is exerting a force on the ground in a downward direction.
 
4     Forces are measured in units called newtons. Newtons were named for the English scientist Isaac Newton who came up with the set of laws that describes forces and motion. It takes about forty newtons to lift a small dog.

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Forces and Motion
             Forces and Motion


Science
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