Why it gets easier to push open a door, the further you are from the hinge?
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If you’re on the playground and want to balance a teeter-totter, you have a few options to play around with if the weights don’t line up right. Move kids on the heavier side further towards the middle, or kids on the lighter side towards the edge, and it can balance things out.
A door is basically a teeter-totter where the other “side” is gravitational inertia. A heavy door takes a lot of force to move, but being further from the hinge gives you a lever to act as a force multiplier for your movement.
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