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COMEDK2021PhysicsLaws of Motion

When a car of mass m is moving with speed v along a circle of radius r on a level road, the centripetal force is provided by f , where f denotes ( _ s . coefficient of friction, N normal reaction)

Options

  1. Am v² r =f _ s N
  2. Bf < _ s = m v² r
  3. Cf= _ s N= m v² r
  4. Df= _ k N= m v² r

Correct answer

A. m v² r =f _ s N

Step-by-step solution

For a car of mass m moving in a circular path of radius r with speed v on a level road, the centripetal force required is given by F_ c = mv² r . On a level road, this centripetal force is provided by the static frictional force f acting between the tires and the road surface. The static frictional force f can take any value from 0 up to the maximum limiting friction, which is given by f_ max = _ s N , where _ s is the coefficient of static friction and N is the normal reaction. For the car to safely negotiate the

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