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The force of friction is normal reaction between the surfaces.

1. Inversely propotional to
2. directly propotional to
3. propotional to the square of
4. independent of

Correct answer: directly propotional to

Solution

For dry friction, the frictional force is modeled as F = μN, where N is the normal reaction. Since μ is constant for a given pair of surfaces, friction increases directly with the normal reaction.

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