The force of friction on a car wheel, on a road, of mass "m" is
Correct answer: C. μmg
- A. mμ
- B. μmg2
- C. μmg
- D. μm2
Explanation
The correct answer isμmg. The frictional force (f) on a flat surface is calculated using the formula f = μN, where μ is the coefficient of friction and N is the normal force. On a flat surface, the normal force is equal to the gravitational force exerted by the mass of the car, N = mg. Therefore, the frictional force is f = μmg. The optionmμis incorrect because it ignores the gravitational component necessary for calculating the normal force. The optionμmg2overestimates the frictional force by including an extra factor of g. Finally,μm2is incorrect because squaring the mass is not relevant to calculating frictional force.
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