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      Question

      A car when passes through a convex bridge exerts a force

      on it which is equal to-
      A mv2/R Correct Answer Incorrect Answer
      B mg + mv2/R Correct Answer Incorrect Answer
      C mg - mv2/R Correct Answer Incorrect Answer
      D none of these Correct Answer Incorrect Answer

      Solution

      Suppose that the body exerts a force N on the surface when it travels through the convex surface. The forces on the car is mg downwards and N upwards. Hence the total force mg−N will provide the essential centripetal acceleration to the car. ⇒ mg - N = mv2/R ⇒ N= mg- mv2/R

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