It’s easier when two people share the lifting of heavy objects and pulleys work in the same way. When you pull the rope, the pulley helps you lift heavy objects more easily because it spreads ...

And then you see something like an infinitely variable transmission built from nested pulleys, and you realize there’s always room for improvement. The electric motors generally used in robotics ...

Various pulleys with different degrees of mechanical advantage (1:1, 1:2, and 1:4) can be used with different masses and a newton scale to perform a quantitative demonstration. Mount the rod ...