railway RRB JE (CBT I + CBT II) Mock Test 2024 Engineering Mechanics Equilibrium and Friction Friction
Which of the following statements about friction is true?
1
Friction can be reduce to zero.
2
Friction force can accelerate a body.
3
Friction force is proportional to the area of contact between the two surfaces.
4
Kinetic friction is always greater than rolling friction.