Physics
What is the force of attraction between any two bodies by virtue of their masses is called?

Gravitational Force
Electromagnetic Force
Centripetal Force
Nuclear Force

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

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

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