Physics
Grade-9
Easy

Question

Which of these affect the force of friction?

  1. Nature of the surface
  2. Speed of the object
  3. Area of contact
  4. None of the above

hintHint:

Friction is a contact force when two surfaces interact.

The correct answer is: Nature of the surface


    • Friction is a resistive force, which comes into play when there is a relative motion between two bodies in contact. 
    • The frictional force between two bodies depends mainly on three factors: (I) the adhesion between body surfaces (ii) roughness of the surface (iii) deformation of bodies.
    • Friction is a contact force when two surfaces interact. Hence, so friction depends on the surface of contact as the surface of contact increases the frictional force also increases.

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