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From the graph given, identify which region represents which of the following types of friction? 1. Static 2. Kinetic 3. Limiting Here, A is the region to the left of the dotted lines and B is the region to the right of dotted lines. C is the line next to which the letter is indicated.

From the graph given, identify which region represents which of the following types of friction? 1. Static 2. Kinetic 3. Limiting Here, A is the region to the left of the dotted lines and B is the region to the right of dotted lines. C is the line next to which the letter is indicated. Correct Answer A-1, B-3, C-2

Explanation:

Friction: Friction is an opposing force that comes into play when a body is actually moving (slide or roll) or even tries to move over the surface of another body.

  • Static friction (Fs): It is an opposing force that acts when it tends to move over the surface, but the actual motion is yet not started.
  • Limiting friction: Limiting friction occurs when the moving force and the force opposing motion are equal; any addition to the moving force will cause slipping.
  • Kinetic friction (Fk): kinetic or dynamic friction is an opposing force that is active when a body is actually moving on another surface.

Kinetic friction is always slightly less than static friction, Fk < Fs.

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The magnitude of static friction is given as:

Fs ≤ μsN

where μs = coefficient of static friction, N = normal reaction, and Fs = static friction force.

The magnitude of the kinetic friction is given as:

Fk = μkN

where μk = coefficient of kinetic friction, N = normal reaction, and Fk = Kinematic friction force.

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