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7Sci CH5

7th Science CH5 Machines

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