Friction

Question 1

What is friction

Answer 1

It is an opposing force which comes into play when one body moves or tries to move over the surface of another body

Question 2

What is limiting friction

Answer 2

It is the maximum value of static friction which comes into play when the body just begins to move over the surface of the other body

Question 3

What are the laws of limiting friction

Answer 3

1. Depend on nature of surface
2. force is tangential or parallel and its direction is opposite to the direction the body tries to move
3. limiting friction is directly proportional to the reaction force

Question 4

What are the laws of kinetic friction

Answer 4

1. Independent of contact area
2. almost constant for a given pair of surfaces
3. friction is directly proportional to normal reaction force

Question 5

What is angle of repose

Answer 5

The minimum angle at which the body placed on an inclined surface begins to start moving

Question 6

What is the formula for rolling friction

Answer 6

f = μ * Reaction force/ radius

Question 7

Is it easier to pull or push a roller

Answer 7

It is easier to pull