Question

How do pulleys affect weight?

Answer 1

Explanation:

1. A pulley is just a set of one or more wheels over which is a rope is looped(or sturdy chain, for heavier objects).They are called as “simple machines” because they allow humans to multiply the forces that allow us to lift a heavy weight. Using a pulley greatly multiplies the force of your physical efforts.
2. A pulley with only one wheel lets you to reverse the direction of your lifting force by pulling down on a rope (that’s looped over the wheel), lifting your weight.
3. With a two-wheel pulley set, you reduce the effort you exert to lift the same amount of weight. You lift the weight with half the force yoyu have applied with one pully system. This is called the mechanical advantage (ME) and your two-wheeled pulley gives you an ME of two.
4. The greater the mechanical advantage, the less force you need to lift a weight.
5. The more wheels a rope can loop around, the more weight it will be able to lift. This type of pulley system often is referred to as a block-and-tackle pulley system and usually is comprised of a rope wound around two axles several times.