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.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.