Physics
Acceleration is

Directly proportional to mass
Inversely proportional to mass
Directly proportional to force
Inversely proportional to force

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Physics
Skating on ice is possible because

Ice is cold
The pressure on the ice due to skate raises its melting point
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

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