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Mechanical Engineering - Theory of machines - Discussion

Discussion Forum : Theory of machines - Section 5 (Q.No. 17)
Theory of machines
17.
Which of the following statements regarding laws governing the friction between dry surfaces are correct?
The friction force is dependent on the materials of the contact surfaces.
The friction force is directly proportional to the normal force.
The friction force is independent of me area of contact.
all of the above
Answer: Option
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