By: Alexia Garvin and Morgan Salazar
What is a pulley?
How does it provide mechanical advantage?
Calculate the Mechanical Advantage...
1. Identify the fulcrum. This will be the point about which the the board or rigid object pivots around.
2. Identify the locations of the input and output forces. The input force is the force that is applied to the lever, oftentimes by a machine or human. The output force is the force that the lever exerts onto an object.
3. Find the distance between the fulcrum and the input force. This is known as the resistance arm.
4. Find the distance from the fulcrum to the output force. This is known as the effort arm.
5. Divide the length of the effort arm by the length of the resistance arm to calculate mechanical advantage.
6. MA = L (effort arm) / L(resistance arm)
Suppose that a pulley system, you need to exert a force of 1,400 N to lift a heavy object. But without the pulley system, you need to exert 4,200 N to lift the object. What is the mechanical advantage of the pulley system?