1. . Friction always tries to ____ the motion of the body.
(A) Stop
(B) Increase
(C) Decrease
(D) Keep constant
2. . Relation between coefficient of static friction and coefficient of kinetic friction is:
μk')"> (A) μs > μk
μk')"> (B) μs < μk
μk')"> (C) μs = μk
μk')"> (D) μs = 1/μk
3. . Limiting friction is ____ to the normal reaction.
(A) Greater
(B) Less
(C) Directly proportional
(D) Inversely proportional
4. . Coefficient of friction is equal to:
(A) R/F
(B) μ/F
(C) R/μ
(D) F/R
5. . Coefficient of friction (μ) is equal to:
(A) sinα
(B) cosα
(C) tanα
(D) secα
6. . The friction in ball bearing is:
(A) Sliding
(B) Static
(C) Limiting
(D) Rolling
7. . The friction acting on solid bodies moving in fluids is called:
(A) Dynamic friction
(B) Sliding friction
(C) Rolling friction
(D) Fluid friction
8. . Friction depends upon ____ of the body.
(A) Shape
(B) Roughness
(C) Area
(D) Volume
9. . Maximum force of friction is called:
(A) Static
(B) Limiting
(C) Dynamic
(D) Kinetic
10. . When we walk or run, to push the ground backward we need:
(A) Inertia
(B) Position
(C) Friction
(D) Velocity