Question

which motion has magnitude of static frictional force directly proportional to normal reaction?​

Answer 1

Answer:

Static friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces. The coefficient of friction is the ratio of the magnitude of frictional force divided by the normal force magnitude.

Answer 2

Answer:

Impending motion has magnitude of static frictional force directly proportional to normal reaction.

Explanation:

• The impending motion refers to the state of a body when it is on the verge of slipping. In such cases, the static friction has reached its upper limit
• For a given pair of surfaces in contact, the frictional force is given by the equation, F = Fmax = μsN
• The direction of the frictional force will always be opposite to the Impending relative motion of the surfaces. If the applied force (P) is increased then the frictional force (F) will also get increased, until F < Fₛ (limiting static frictional force). When F = Fₛ then the body is said to possess an unstable equilibrium and said to be in motion.

Hence, impending motion has magnitude of static frictional force directly proportional to normal reaction.

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