Physics
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.

Newton's third law of motion
Law of Inertia
Law of conservation of energy
Law of conservation of momentum

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids

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