A horizontal force of 3500 N is capable of moving an abandoned vehicle of mass 750 kg on a rough horizontal road. Find the coefficient of friction between the vehicle and the road. [Take g=9.8 ms−2]
Worked solution (try it first)
On a horizontal road the normal reaction equals the weight: R=mg=750×9.8, which is 7350 N.
The force just moves the vehicle, so friction is limiting: μR=3500.