# Mechanical Engineering - Engineering Mechanics

### Exercise :: Engineering Mechanics - Section 6

31.

For any system of coplaner forces, the condition of equilibrium is that the

 A. algebraic sum of the horizontal components of all the forces should be zero B. algebraic sum of the vertical components of all the forces should be zero C. algebraic sum of moments of all the forces about any point should be zero D. all of the above

Explanation:

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32.

The ratio of static friction to dynamic friction is always

 A. equal to one B. less than one C. greater than one D. none of these

Explanation:

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33.

A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is

 A. justified B. not justified

Explanation:

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34.

One kg force is equal to

 A. 7.8 N B. 8.9 N C. 9.8 N D. 12 N

Explanation:

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35.

Coefficient of friction depends upon

 A. area of contact only B. nature of surface only C. both (a) and (b) D. none of these