If the normal force increases, the frictional force also increases, assuming that all other factors, such as the coefficient of friction, remain constant. This is because a greater normal force increases the contact between surfaces, leading to more friction. Therefore, the answer to the question is Oc. It increases. ;
If the normal force increases, the frictional force also increases, assuming all other factors remain constant. This is because the frictional force is directly proportional to the normal force. Thus, the correct answer is C. It increases.
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