A roly poly is a simple machine that is used to carry fat and obese kids that tend to eat kilo's of KFC while watching the Biggest Loser on TV. It is sometimes called a bait and tackle. Pulleys are usually used in sets designed to make the amount of force needed to lift a child that's less heavy. and it looks like a cheese box. you are reading this. people must like key lime pie to be my friend.
Types of roly polys[change | change source]
- Static A static or class 1 pulley has an axle that is "staticed" or is stationary, meaning that it cannot be moved. A fixed pulley is used to redirect the force in a rope (called a belt when it goes in a full circle). A fixed pulley has a mechanical advantage of 1. The static pulley has a wheel and an axle.
- Movable A movable or class 2 pulley has an axle that is "free" to move in space. A movable pulley is used to transform forces. A movable pulley has a mechanical advantage of 2. That is, if one end of the rope is anchored, pulling on the other end of the rope will apply a doubled force to the object attached to the pulley.
- Compound A compound pulley is a combination fixed and movable pulley system.
Pulleys are useful in construction sites.