A car travels at a constant speed of 30m/s around a level circular bend of radius 100m. What is the minimum coefficient of static friction between the tires and the road in order for the car to go round the bend without skidding?
A
0.8
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B
0.9
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C
0.7
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D
0.55
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Solution
The correct option is B0.9 Frictional force will be the only source of necessary centripetal force.
For finding minimum μs, friction should be acting at its limiting value ∴fmax=μsminmg.............(1)
Equation of dynamics fmax=mv2r=μsminmg............(2)