A single pulley only changes the direction of the applied force. A second or more pulleys on the same rope will multiply the force applied by decreasing the distance of the applied force. This arrangement is called a block and tackle. Two pulleys double the force and halve the distance the force acts upon the mass. Three will triple the force while reducing the distance by 1/3, and so on.
If 1 pound of force is applied to a rope with four pulleys on it over the distance of 10 feet of rope it will raise a 4 pound weight 2 1/2 feet.
A single pulley alters the direction of the input but confers no mechanical advantage.
Do the moveable pulley decreases the input force?
A hanging pulley or a Class-I lever can both do that.
The input force is how much force you use to pull on it. The output is what is lifted.
It's easier to pull downward than upward.
They pulley is applied by the output force and then it is being added on by the input work.
A single pulley alters the direction of the input but confers no mechanical advantage.
Do the moveable pulley decreases the input force?
A hanging pulley or a Class-I lever can both do that.
The input force is how much force you use to pull on it. The output is what is lifted.
True
It's easier to pull downward than upward.
wateva !
no it can't.
Yes. The IMA of a movable pulley is 2.
The difference between a fixed pulley and a movable pulley is, the wheel of a fixed pulley does not move because the wheel is attached to a wall, ceiling, or other object. Unlike a fixed pulley, a movable pulley's wheel does move. The wheel on a movable pulley is not attached to a wall or other object. A fixed pulley changes work by changing the direction of a force. A movable pulley changes work by reducing the input force needed to lift heavy objects. A movable pulley changes the direction of the input force and reduced it. A movable pulley also increases the output force.
A pulley system may cause the direction of the output force to differ from that of the input force, but is not guaranteed to do so. In a simple example, a double pulley could easily result in input and output forces in parallel.