# Mcqs On Friction

Q:

### Brakes of very small contact area are not used although friction is independent of area, because friction

 Resists motion Causes wear and tear Depends upon the nature of materials Operating in this case is sliding friction
Q:

### Two bodies having the same mass, 2 kg each have different surface areas 50m2 and 100m2 in contact with a horizontal plane. If the coefficient of friction is 0.2, the forces of friction that come into play when they are in motion will be in the ratio

 1 : 1 1 : 2 2 : 1 1 : 4
Q:

### When a body is moving on a surface, the force of friction is called

 Static friction Dynamic friction Limiting friction Rolling friction
Q:

### A box is lying on an inclined plane what is the coefficient of static friction if the box starts sliding when an angle of inclination is 600

 1.173 1.172 2.732 1.677
Q:

### A force of 98 Newton is required to drag a body of mass 100 kg on ice. The coefficient of friction will be

 0.98 0.89 0.49 0.1
Q:

### Starting from rest, a body slides down a 450 inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is

 0.33 0.25 0.75 0.8
Q:

### A block of mass 10 kg is placed on an inclined plane.  When the angle of inclination is 300, the block just begins to slide down the plane.  The force of static friction is

 10 kg wt 89 kg w 49 kg w 5 kg w
Q:

### To avoid slipping while walking on ice, one should take smaller steps because of the

 Friction of ice is large Larger normal reaction Friction of ice is small Smaller normal reaction
Q:

### Which one of the following is not used to reduce friction

 Oil Ball bearings Sand Graphite
Q:

### The angle between frictional force and the instantaneous velocity of the body moving over a rough surface is

 Zero π/2 π Equal to the angle of friction