Friction Test - 2

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

Which one of the following is not used to reduce friction

A block of mass 10 kg is placed on an inclined plane. When the angle of inclination is 30^o, the block just begins to slide down the plane. The force of static friction is

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 60^o

A brick of mass 2 kg begins to slide down on a plane inclined at an angle of 45^o with the horizontal. The force of friction will be

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

Two bodies having the same mass, 2 kg each have different surface areas 50 m² and 100 m² 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

Starting from rest, a body slides down a 45° 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

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