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When a car is driven too fast around a curve it skids outward. How does passenger sitting inside explain the car’s motion? How would an observer standing by the road side explain the event?

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The passenger inside the car is in the reference frame of the car so he experiences centrifugal force

= \(\frac{mv^2}{r}\) acting on the car. So, to remain in circular path force should be larger as it is proportional to v2. For an observer on the road side finds that the centripetal force \(\frac{mv^2}{r}\) acting on the car becomes inadequate with increases in v. Since again v2 ∝ r is insufficient so the car skids.

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