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A push or pull is a force. A force changes the way an object moves. You need different amounts of force to move different objects. The heavier the object, the more force you need to move it. |
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What happens to a ball if you throw it into the air? Gravity will pull the ball down. The earth's gravity is a force that pulls objects toward the center of the earth. The more mass an object has, the more gravity pulls on it. |
| Imagine rolling a ball across a floor. Think about how the ball would stop moving. Friction is a force that makes moving objects slow down or stop. The friction between the ball and the floor would make the ball stop moving. Rub your hands together. Notice how your hands feel warm when they rub together. Friction causes heat |
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Work is done whenever a force makes an object move. You do work when you move a pencil across the desk. The amount of work you do depends on how much force you use and how far the object moves. |
| You can move around because
you have energy.
Energy is the ability to do work. You use energy whenever you use force to move an object through a distance. The more work you do, the more energy you need. |
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What are Simple Machines?
Machines are tools that use energy to do works. Simple Machines are machines with a few or no moving parts. There are six basic simple machines. Find the name of each machine, what it is, what work it does and examples. Use the following web sites to help. |
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| Simple
Machines Construction Site
MiKids.com Edheads.org |
Spotlight
on simple machines Simple Machines by the Spice Boys Inventer's Toolbox Canada Science and Technology Museum |
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Read about the six simple machines. Then make
a power point presentation about simple machines. Your presentation
should have the following information.
Page 1 - Title, Your Name, Picture
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