According to Teach Engineering, a pulley system helps to perform work by switching directions of force and simplifying the movement of large objects. Different types of pulley systems include fixed, movable and multiple.Know More
In a fixed pulley system, the wheel is fixed to a shaft so users can take advantage of gravity, balance an object, and help raise objects above their head. However, a fixed pulley gives no mechanical advantage, as the input force that the user provides is equal to the force of the pulley.
Movable pulleys utilize a movable wheel and differ in other respects. According to Education.com, movable pulleys have a greater mechanical advantage, meaning that the input force is less than the force of the system. Both systems also require separate amounts of rope pulls. Experts say that movable pulleys require more rope pulls by the user as the weight is lighter, but fixed pulleys require less rope pulls.
In addition, the multiple pulley is comprised of both fixed and movable pulley systems. These pulleys are easiest to lift objects with, as the mechanical advantage increases in tandem with the inclusion of more ropes, as cited by Teach Engineering. Applications of pulley systems are seen in flagpoles, modern elevators and weightlifting machines.Learn More
A pulley makes work easier by redirecting and amplifying force. It helps reverse the direction of an individual’s lifting force. As a user pulls a rope down, the pulley lifts the weight up. When two ropes and wheels are used, a pulley reduces the effort needed to lift a weight by half.Full Answer >
A fixed pulley makes work easier by changing the direction of the force required to lift a load. To raise a load with a fixed pulley, a downward force is needed, which is easier than the upward force needed to lift the load directly.Full Answer >
According to Jibbaroo, to make a compound pulley system, you need two wheels from a K'nex set, seven paper clips, tape, string and a 1- to 3-pound hand weight or an unopened can of food. Jibbaroo provides the steps needed to construct the pulley system.Full Answer >
A combined pulley is a type of pulley that has and uses movable and fixed pulleys simultaneously. In this system, many pulleys can be used at the same time with less weight needed to lift an object.Full Answer >