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Question

The contact forces of mechanics are fundamentally derived from


A

Gravitational forces

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B

Friction

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C

Electrical forces

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D

Viscous forces

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Solution

The correct option is C

Electrical forces


At the microscopic level, all bodies are made of charged constituents (nuclei and electrons) and the various contact forces arising due to elasticity of bodies, molecular collisions and impacts, etc. can ultimately be traced to the electrical forces between the charged constituents of different bodies.


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