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Concepts Of Physics MCQ Edition [Volume 1]PhysicsFriction

To prevent slipping when walking on ice, one should take small steps. This is due to the fact that shorter steps ensure

Options

  1. Asmaller friction
  2. Blarger friction
  3. Csmaller normal force
  4. Dlarger normal force

Correct answer

A. smaller friction

Step-by-step solution

Let the leg make an angle with the vertical while walking. The normal force N and the frictional force f provided by the ground are related by f = N . To avoid slipping, the required frictional force must be less than or equal to the limiting friction, i.e., f N . Since the coefficient of friction for ice is very small, the required friction f must be small. Taking shorter steps makes the angle smaller, which in turn reduces the required frictional force f . Therefore, shorter steps ensure smaller friction is neede

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