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Two-pan balance

If the length of the lever arm is four times the load it has to bear, then the force to equalise the lever arm is one quarter of that load.

Aircraft taking off

The velocity of an airplane taking off changes quickly, so it has a fast acceleration.

Ball rolling down a slope

The ball rolling down the inclined plane accelerates uniformly

Mikola tubes

The bubble moves faster in the steeply held tube.

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