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| a push or pull that makes an objects change movement |
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| the force that pulls any two objects toward each other |
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| the tendency of a moving object to keep moving or a resting object to stay at rest |
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| a force that slows down moving objects |
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| what happens when a force makes an object move |
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| something that makes work easier |
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| You are trying to move a heavy rock. What simpl?e machines could you use to make this task easier |
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Definition
| You could use an inclined plane because it makes a heavy object in a wheelbarrow easier to pull |
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| Two children of equal size and strength are having a tug-of-war. If you are the judge of the contest, how can you tell if either of them has done any work? |
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| You could tell if they do any work by the rope it is moving. |
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| Forces can make objects stop or start moving, slow down, speed up, or change direction. |
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| Inertia causes a ball to return to Earth after you throw it. |
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| Friction exists whenever two objects rub against each other. |
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| Friction causes objects to move faster or fly higher. |
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| When you begin to slide down a slide, kinetic energy is converted into energy of motion. |
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| Potential energy can be converted to kinetic energy. |
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| A car's engine works because of mechanical energy. |
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| When you walk very slowly, you are doing work. |
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| A wheel and axle is an example of a simple machine. |
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| A motorcycle is an example of a complex machine. |
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