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Question

The angle which the resultant of the limiting friction and the normal reaction makes with the normal reaction is ________ .

सीमित घर्षण और सामान्य प्रतिक्रिया का परिणाम सामान्य प्रतिक्रिया के साथ जो कोण बनाता है वह ________ होता है।

A.

Angle of repose        

B.

Angle of friction

C.

Angle of contact

D.

None of these

Answer ( Option B)

Angle of friction

Solution

Angle of Friction (θ):
  • The angle of friction between any two surfaces in contact is defined as the angle which the resultant of the force of limiting friction Flim and normal reaction N makes with the direction of normal reaction N.

Angle of Repose (α):
  • The angle of repose or angle of sliding a is defined as the minimum angle of inclination of a plane with the horizontal such that a body placed on the plane just begins to slide down.

The angle of limiting friction(φ):
  • Limiting Angle of Friction is defined as the angle which the resultant reaction (R) makes with the normal reaction (RN).
  • In the limiting case, when the body just begins to move, it is in equilibrium under the action of the following three forces:
1. Weight of the body (W),
2. Applied horizontal force (P), and
3. Reaction (R) between the body A and the plane B.
The reaction R must, therefore, be equal and opposite to the resultant of W and P and will be inclined at an angle (φ) to the normal reaction (RN). This angle φ is called the limiting angle of friction or simply angle of friction.

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