Wheel and Axle Pulley The rotation of the against a point Instead of an axle, the could also rotate pries objects loose. That rotation motion a rope or cord. This variation of the wheel can also do other kinds of work. Another and axle is the pulley. In a pulley, a cord kind of lever, the wheel and axle, moves wraps around a wheel. As the wheel rotates, objects across distances. The wheel, the the cord moves in either direction. Now, round end, turns the axle, the cylindrical attach a hook to the cord, and you can use post, causing movement. On a wagon, for the wheel's rotation to raise and lower example, the bucket rests on top of the objects. On a flagpole, for example, a rope axle. As the wheel rotates the axle, the is attached to a pulley. On the rope, there wagon moves. Now, place your pet dog in are usually two hooks. The cord rotates the bucket, and you can easily move him around the pulley and lowers the hooks around the yard. On a truck, for example, where you can attach the flag. Then, rotate the cargo hold rests on top of several the cord and the flag raises high on the pole. axles. As the wheels rotate the axles, the truck moves. Screw Lever Now, take an inclined plane and wrap it Try pulling a really stubborn weed out of the around a cylinder. Its sharp edge becomes ground. You know a deep, persistent weed another simple tool: the screw. Put a metal that seems to have taken over your screw beside a ramp and it's kind of hard to flowerbed. Using just your bare hands, it see the similarities, but the screw is actually might be difficult or even painful. With a just another kind of inclined plane. Try this tool, like a hand shovel, however, you demonstration to help you visualize. How should win the battle. Any tool that pries does the screw help you do work? Every something loose is a lever. A lever is an turn of a metal screw helps you move a arm that "pivots" (or turns) against a piece of metal through a "fulcrum" (or point). Think of the claw end
Wheel and Axle The rotation of the against a point pries objects loose. That rotation motion can also do other kinds of work. Another kind of lever, the wheel and axle, moves objects across distances. The wheel, the round end, turns the axle, the cylindrical post, causing movement. On a wagon, for example, the bucket rests on top of the axle. As the wheel rotates the axle, the wagon moves. Now, place your pet dog in the bucket, and you can easily move him around the yard. On a truck, for example, the cargo hold rests on top of several axles. As the wheels rotate the axles, the truck moves. Pulley Instead of an axle, the could also rotate a rope or cord. This variation of the wheel and axle is the pulley. In a pulley, a cord wraps around a wheel. As the wheel rotates, the cord moves in either direction. Now, attach a hook to the cord, and you can use the wheel's rotation to raise and lower objects. On a flagpole, for example, a rope is attached to a pulley. On the rope, there are usually two hooks. The cord rotates around the pulley and lowers the hooks where you can attach the flag. Then, rotate the cord and the flag raises high on the pole. Screw Now, take an inclined plane and wrap it around a cylinder. Its sharp edge becomes another simple tool: the screw. Put a metal screw beside a ramp and it's kind of hard to see the similarities, but the screw is actually just another kind of inclined plane. Try this demonstration to help you visualize. How does the screw help you do work? Every turn of a metal screw helps you move a piece of metal through a Lever Try pulling a really stubborn weed out of the ground. You know a deep, persistent weed that seems to have taken over your flowerbed. Using just your bare hands, it might be difficult or even painful. With a tool, like a hand shovel, however, you should win the battle. Any tool that pries something loose is a lever. A lever is an arm that "pivots" (or turns) against a "fulcrum" (or point). Think of the claw end
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