Factors Affecting Friction
- F1 is static friction, and F2 is sliding friction.
- F1 > F2
- F1 = F2
- F2acts in same direction as F1
Which of the following is not a lubricant?
None of these
Neha has to push a light box and Sohit has to push a comparatively heavier box made of same material, on the same horizontal floor. What can we say about the forces applied by them?
It runs out of push
It runs out of electricity
Force of gravity made it slow
It rubs against the ice
A cube is pushed in such a way that it is sliding on a horizontal surface. Frictional force acting on the cube can be increased by:
Polishing the outer surface of the cube.
Adding wheels to the cube.
Applying lubricant between the cube and the surface.
Placing another identical cube on top of the cube.
(a) Materials of the body in
- roughness of the surfaces
- shape of the surfaces
- colour of the surfaces
- area of the surfaces
Which of the following is a lubricant?
Consider the following statements:
Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.
Statement 2: Frictional force increases if the two surfaces are pressed harder.
Which of these statements is/are correct?
Only statement 1 is correct.
Only statement 2 is correct.
Both the statements are correct.
Neither of the statements is correct.
- Applying lubricant between surfaces
Using powder between surfaces
- Making the surfaces more irregular
- Using ball bearings