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A pulley is really a kind of wheel, just as a screw is a kind of inclined plane. But pulleys are so important that people give them their own category. A pulley is a wheel with two raised edges. The raised edges are so that a rope or a string will run along the wheel without coming off.
Physics 204A Class Notes 13-4 Section Summary We examined systems with pulleys and ropes, which change the direction of motion. The power of treating separate objects as distinct systems was shown. By applying the Second Law to each system we were able to combine the resulting equations to solve the problems.
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Simple machine - Simple machine - The pulley: A pulley is a wheel that carries a flexible rope, cord, cable, chain, or belt on its rim. Pulleys are used singly or in combination to transmit energy and motion. Pulleys with grooved rims are called sheaves. In belt drive, pulleys are affixed to shafts at their axes, and power is transmitted between the shafts by means of endless belts running ...
A simple example of this consists of a pulley, groved to accommodate the rope, top and bottom with a rope threaded round as shown. Finding the velocity ratio (V.R.) of this 'simple machine' is best done by holding ropes (a) and (b) and lifting the bottom block bodily, say by 1 mtr.
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Construct an 11-pulley block and tackle. This consists of a system of pulleys to lift a load. You will need to find or make the pulleys. Ref. 6, p. 61. 2. Construct an elevator. Complete with shaft, counterweight and a hand crank to move the load. This will also consist of a system of pulleys. Ref. 6, p. 65. 3. Construct a wooden nutcracker.
A block and tackle is an assembly of pulley blocks and rope or cables that are set up to decrease the effort needed to haul or hoist heavy loads. Each block has one or more pulley. Thread the rope, alternating between the pulley attached to the block on the object you want to move and the pulley attached to a fixed ...