Laws of Motion 2 Question 3

3. A block of mass m is at rest under the action of force F against a wall as shown in figure. Which of the following statement is incorrect?

(2005,2M)

(a) f=mg (where f is the frictional force)

(b) F=N (where N is the normal force)

(c) F will not produce torque

(d) N will not produce torque

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Answer:

Correct Answer: 3. (c)

Solution:

  1. This is the equilibrium of coplanar forces. Hence,

ΣFx=0F=NΣFy=0,f=mgΣΣτc=0 Since, τN+τf=0τf0τN0



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