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JEE Main202117 Mar 2021Morning ShiftPhysicsMotion in Two DimensionsActual

A modern grand-prix racing car of mass m is travelling on a flat track in a circular arc of radius R with a speed v . If the coefficient of static friction between the tyres and the track is μ s , then the magnitude of negative lift F L acting downwards on the car is:

Options

  1. Am v 2 μ s R + g
  2. Bm v 2 μ s R - g
  3. Cm g - v 2 μ s R
  4. D- m g + v 2 μ s R

Correct answer

B. m v 2 μ s R - g

Step-by-step solution

μ s N = m v 2 R N = m v 2 μ s R = m g + F L F L = m v 2 μ s R - m g

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