separate two objects or portions of an object, lift up an object, or hold an object in place

is most commonly made out of a rope and something circular like a wheel

The most common form consists of a cylindrical shaft with helical grooves or ridges called threads around the outside

wheel and axle is a simple machine consisting of a wheel attached to a smaller axle so that these two parts rotate together

a ramp is some thing that act like a platform. that can help
move heavy loads over vertical obstacles