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20 Cards in this Set
- Front
- Back
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What is a force? |
a push or a pull |
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What is the force that pulls all objects toward it? |
gravity |
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What is the force that resists the movement of objects against each other? |
friction |
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What is motion? |
a change in position |
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When is work done? |
when a force moves an object over a distance |
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What is energy? |
the ability to do work |
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Scientifically, what 2 factors determine the amount of work you do? |
how much force you use to move an object and how far you move an object |
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What is a machine? |
any object that makes work easier |
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What is effort? |
the force you apply to cause a simple machine to do work |
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What is the load? |
the weight of the object being moved |
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What is a bar that turns on a point? |
lever |
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What is the point that the bar of the lever turns on? |
fulcrum |
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What influences the amount of effort needed on a lever? |
The distance between the effort and the fulcrum. The farther the effort is from the fulcrum, the less effort you need. |
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What is a simple machine that has a grooved wheel with a rope that fits in the groove? |
pulley |
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What are 2 types of pulleys? |
fixed and moveable |
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What kind of pulley allows you to use less force when lifting an object because the rope moves a greater distance? |
block and tackle pulley |
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What is an inclined plane? |
a flat, sloped surface |
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What is an inclined plane wound around an axle? |
screw |
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What is the inclined plane on a screw called? |
thread |
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What simple machine is made up of one or more inclined planes that are used to force materials apart? |
wedge |
