# Civil Engineering - Applied Mechanics

### Exercise :: Applied Mechanics - Section 4

1.

A retarding force on a body does not

 A. change the motion of the body B. retard the motion of the body C. introduce the motion of the body D. none of these.

Explanation:

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2.

The unit of force in C.G.S. system of units, is called

 A. dyne B. Newton C. kg D. all the above.

Explanation:

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3.

A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is

 A. 17° 48' B. 18° 48' C. 19° 48' D. 20° 48' E. 21° 48'.

Explanation:

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4.

From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of

 A. 2.0 cm B. 1.5 cm C. 1.0 D. 0.5 cm.

Explanation:

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5.

The force which produces an acceleration of 1 m/sec2 in a mass of one kg, is called

 A. dyne B. Netwon C. joule D. erg.