what is pully write seven examples
Answers
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell which does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave.
A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain.
Hero of Alexandria identified the pulley as one of six simple machines used to lift weights.[1] Pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another.[2][3]
Examples of pulleys include:
Elevators use multiple pulleys in order to function.
A cargo lift system that allows for items to be hoisted to higher floors is a pulley system.
Wells use the pulley system to hoist the bucket out of the well.
Many types of exercise equipment use pulleys in order to function.
Construction pulleys are used in order to lift and place heavy materials.
Curtains at a theatre are moved using pulley systems that pull the curtains apart.
Blinds on windows operate using a pulley system to move the blinds up and down. You pull the cord on the blinds and the pulley system causes the blinds to open or close.
Flagpoles use pulleys in order to hoist the flag up or to bring it down. You pull the string on the pulley and the flag runs up or down the pole.
Clotheslines can use pulley systems in order to make it easier to pull clothes toward the user.
Pulleys can be used to place birdfeeders high in trees or on poles, and then to pull them down when they need to be refilled or removed.
Roofers may use pulleys in order to hoist all of the shingles up on to the roof instead of attempting to carry them.
A crane is a type of pulley that is used in construction.
Engines utilize a pulley system in order to work.
Fans with chains are utilizing a pulley system in order to be turned on and off.
A bulldozer is an example of use of a pulley system.
Pulleys are utilized regularly in oil derricks.
Pulleys can be used to extend ladders.
Sails on sailboats are raised and lowered using pulleys.
Garage doors raise and lower utilizing a pulley system.
Rock climbers use pulleys to help them to climb.
Timing belts in cars are examples of pulleys.
Escalators utilize pulley systems to function
Read more at http://examples.yourdictionary.com/pulley-examples.html#Whlb0huswmR5rFjT.99