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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Circular force balance

Grip sets a turning speed

A car rounds a flat circle of radius 50 m. The maximum static friction coefficient is 0.50.

Find the maximum speed before slipping.

Organize the givens & assumptions
  • r = 50 m
  • μs = 0.50

g = 10 m/s²; flat road, no aerodynamic downforce; tyres roll without slipping until static friction reaches its limit.

  1. A510 m s−15\sqrt{10}\ \mathrm{m\,s^{-1}}
  2. B250 m s−1250\ \mathrm{m\,s^{-1}}
  3. C5 m s−15\ \mathrm{m\,s^{-1}}
  4. D105 m s−110\sqrt5\ \mathrm{m\,s^{-1}}

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