Physics
Skating on ice is possible because

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

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is less than that between concrete and feet.
the sand is grainy but concrete is smooth.
sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth
It rotates at the same speed as the earth around the sun
It is smaller than the earth

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