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Pulleys

Pulleys. Reagan Thompson Zack Hartfield Chloe Duval. Pulley Basics. A pulley is a wheel on an axel designed to support movement of a cable or belt along circumference. Pulley system consist of a rope or cable and one or more pulleys

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Pulleys

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  1. Pulleys Reagan Thompson Zack Hartfield Chloe Duval

  2. Pulley Basics • A pulley is a wheel on an axel designed to support movement of a cable or belt along circumference. • Pulley system consist of a rope or cable and one or more pulleys • Three types of pulley systems. Fixed, Moveable, Combined • Pulley System isn’t efficient due to force of friction. Example, one has to pull two meters of rope/cable in order to lift an object one meter.

  3. Fixed Pulley • A fixed pulley is the only pulley that when used individually, uses more effort than the  load to lift the load from the ground. • A fixed pulley is attached to a hook or wall and doesn’t move. •  The advantage of the fixed pulley is that you do not have to pull or push  the pulley up and down. • The disadvantage is that you have to apply more effort than the load

  4. Moveable Pulley A movable  pulley  is a pulley that moves with the load. • The movable pulley allows the effort to be less than the weight of the load. The movable pulley also acts as a second class lever. The load is between the fulcrum and the effort. • The main advantage of a movable pulley is that you use less effort to pull the load. • The main disadvantage of a movable pulley is that you have to pull or push the pulley up or down.

  5. Combined Pulley • A combined pulley makes life easier as the effort needed to lift the load is less than  half the weight of the load. • The main advantage of this pulley is that the amount of effort is less than half of the load. • The main disadvantage is it travels a very long distance.

  6. Review Questions • What is a pulley? • A fixed pulley is ______ and doesn’t ________ • What was this slideshow about?

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