Which of the following doesn’t affect frictional force?

A)
Area of contact
B)
Surface roughness
C)
Reaction of surface
D)
Force tending cause motion

Correct Answer : Option (A) :   Area of contact

Explanation : Friction is a resistive force that acts on a body regardless of the size of the contact area between the surfaces.

Recently Updated in Engineering Mechanics Questions
The coefficient of restitution for elastic bodies is one.
A)
Correct
B)
Incorrect
C)
Both (A) and (B)
D)
Neither (A) nor (B)

Correct Answer :   Incorrect

Explanation : Coefficient of restitution for elastic bodies is 0 - 1.

Coefficient of restitution for perfect elastic bodies is 1.

Which of the following type of screws is used in the machines?
A)
Round-threaded
B)
Helical-threaded
C)
Square-threaded
D)
Rectangle-threaded

Correct Answer :   Square-threaded

Explanation : In the machines, square threaded screws are employed. Because screws are commonly employed as fasteners. The fundamental benefit of screws is that the friction aids in the structure’s retention. Screws also aid in the fast and efficient joining of the structure.

The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
A)
Agree
B)
Disagree
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Agree

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