Why it gets easier to push open a door, the further you are from the hinge?

Question

Why it gets easier to push open a door, the further you are from the hinge?

In: 212

Answer 1

The short version of any sort of “mechanical advantage” explanation is that if you divide the work over twice as much distance then you only have to push half as hard.

When you push something on hinge, you push along the arc of a circle. If you’re twice as far from the hinge you have to push half as hard twice as far.