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 conservation of energy
Law of Inertia
Law of conservation of momentum

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Physics
Skating on ice is possible because

The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The pressure on the ice due to skate raises its melting point
Ice is cold

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