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7Sci CH5
7th Science CH5 Machines
| Term | Definition |
|---|---|
| compound machine | machines, such as fishing rods and bicycles, that are a combination of simple machines, compound machines make it possible to accomplish tasks that simple machines alone can’t |
| effort force | the force applied to a machine |
| inclined plane | ramp or slope that reduces the force needed to lift an object; a more gradual inclined plane increases the distance but reduces the effort force needed to move an object |
| lever | a bar that turns or pivots in a fulcrum |
| mechanical advantage(MA) | the MA of a machine can be found by dividing the resistance force by the effort force, the larger the MA, the more helpful the machine |
| power | tpower is the work done divided by the time it took to do |
| pulley | a simple machine composed of a wheel with a rope or chain passing over it |
| resistance force | the force applied by a machine |
| screw | this simple machine is an inclined plane wound around a post; the ridges spiraling around a screw are called threads, these threads change the screwdriver’s turning force into a downward force that helps lift the wood up around the screw |
| wedge | inclined plane with a sharp,thin edge that cuts through a variety of materials |
| wheel and axle | a simple machine composed of a small wheel attached to the middle of a bigger wheel;a wheel and axle always rotate together; less effort force is needed to turn a large wheel than to turn a small wheel |
Created by:
djhockett5
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