Assertion (A) At the microscopic level, all bodies are made of charged constituents (nuclei and electrons) and various contact forces arise. Reason (R) These forces are due to elasticity of bodies, molecular collisions and impacts, etc.

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Assertion-ReasonContact and Non-Contact Forces

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Assertion (A) It is always necessary that external agency of force is in contact with the object while applying force on object. Reason (R) A stone released from top of a building accelerates downward due to gravitational pull of the earth.

Assertion-ReasonContact and Non-Contact Forces