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levers and pulleys
website: www.knexeducation.co.uk
Key Terms and Scientific Definitions
•Pulley: A wheel with a groove in its outer rim that spins freely on an axle. A rope,
cable, or chain runs in the wheel’s groove and may be attached to a load. As the wheel
turns, the rope moves in either direction so that a pull down on one side will raise an object
on the opposite side of the wheel.
•FixedPulley: A pulley attached to a solid surface; it does not move when the rope
is pulled, other than to turn in place. Fixed pulleys change the direction of an
applied force.
•MovablePulleys: A pulley attached directly to the load being lifted; it moves
when the rope is pulled.
•CombinationPulleys: A series of fixed and movable pulleys used together to gain
the advantages of both in doing the work.
•BlockandTackle: A specific combination of fixed and movable pulleys used to lift
very heavy objects; the block is the frame holding the pulleys; the tackle is the rope
or cable.
•InclinedPlane: A flat surface with one end higher than the other. The most recognisable
form of an inclined plane is a ramp. Ramps make it easier to move from one height
to another.
•Screw: A shaft (body) that has an inclined plane spiralling around it. The inclined plane
forms ridges (threads) around the shaft to become another simple machine: the screw. It
can be used to lift objects or fasten two things together.
•Wedge: A device made of two inclined planes arranged back-to-back. Instead of
moving up the slope, wedges themselves move to push things apart. Wedges are
inclined planes that move pointed-end first and are used in many cutting tools such as
axes, knives and chisels.
Education
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