Concept explainers
A racing car on a flat circular track needs friction between the tires and the track to maintain circular motion. How much more friction is required for twice the speed?
The friction required between the tires of the racing car and the track to maintain circular motion if the speed of the car becomes twice.
Answer to Problem 41A
Four times of the initial friction.
Explanation of Solution
Introduction:
When a car moves on a circular track, then the friction force between its tires and the track is balanced by the centripetal force acting on the car as,
Where,
Let the initial friction force was
Now, if the speed becomes twice, then the new required friction force will be,
Conclusion:
Hence, the new friction force will be four times the initial friction force.
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