Question

If the normal reactional force is doubled, the coefficient of friction is :

• A. doubled
• B. halved
• C. not charged
• D. tripled

Answer 1

The correct option is A doubled

There will be no change in the coefficient of friction .Coefficient of friction between two gives surfaces is constant.

We know that friction force is directly proportional to normal force.

There ratio is what we call the coefficient of friction.

So, if the normal force is doubled then friction force will also double .

Hence ratio will remain same.