The force acting on a point on the surface of a rigid body may be considered to

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Question
The force acting on a point on the surface of a rigid body may be considered to act
Options
A. at the centre of gravity of the body
B. on the periphery of the body
C. on any point on the line of action of the force
D. at any point on the surface normal to the line of action of the force.

Correct Answer

on any point on the line of action of the force

Applied Mechanics problems

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2. The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60�, it is 37 kgf. The magnitudes of the forces are :
Options
A. 2 kgf, 3 kgf
B. 3 kgf, 4 kgf
C. 4 kgf, 5 kgf
D. 5 kgf, 3 kgf.

3. A ball is dropped from a height of 2.25 m on a smooth floor and rises to a height of 1.00 m after the bounce. The coefficient of restitution between the ball and the floor is
Options
A. 0.33
B. 0.44
C. 0.57
D. 0.67

4. Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down
Options
A. rubber and lead balls undergo equal changes in momentum
B. change in momentum suffered by lead ball is less that of rubber ball
C. momentum of rubber ball is less than that of lead ball
D. none of these.

5. A rod 5 m in length is moving in a vertical plane. When it is inclined at 60� to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is
Options
A. 0.5 m/sec
B. 1.0 m/sec
C. 1.5 m/sec
D. 2.5 m/sec
E. 3.0 m/sec

7. The angle of friction is :
Options
A. The ratio of the friction and the normal reaction
B. The force of friction when the body is in motion
C. The angle between the normal reaction and the resultant of normal raction and limiting friction
D. The force of friction at which the body is just about to move.

8. The motion of a particle is described by the relation x = t²- 10t + 30, where x is in metres and t in seconds. The total distance travelled by the particle from t = 0 to t = 10 seconds would be
Options
A. zero
B. 30 m
C. 50 m
D. 60 m
E. none of these.

10. The resultant of two forces acting at right angles is 34 kg and acting at 60� is 70 kg. The forces are
Options
A. 1 kg and 4 kg
B. 2 kg and 3 kg
C. 3 kg and 5 kg
D. 3 kg and 5 kg
E. 3 kg and 5 kg.

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