Questions
101
If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella
Answer: less inclined when standing
102
Limiting force of friction is the
Answer: the friction force acting when the body is just about to move
103
Coulomb friction is the friction between
Answer: bodies having relative motion
105
Kinetic friction is the
Answer: the friction force acting when the body is in motion
106
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
Answer: slant down towards direction of pull
107
The algebraic sum of moments of the forces forming couple about any point in their plane is
Answer: equal to the moment of the couple
108
A single force and a couple acting in the same plane upon a rigid body
Answer: cannot balance each other
109
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
Answer: all the above are correct
110
A cable with a uniformly distributed load per horizontal metre run will take the following shape
Answer: parabola
