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61. 76. Frictional force encountered after commencement of motion is called

A. post friction

B. limiting friction

C. kinematic friction

D. frictional resistance

E. dynamic friction.

Explanation:

62. 88. Limiting force of friction is the

A. tangent of angle between normal-reac-tion and the resultant of normal reac-tion and limiting friction

B. ratio of limiting friction and normal reaction

C. the friction force acting when the body is just about to move

D. the friction force acting when the body is in motion

E. minimum force of friction.

Explanation:

63. 74. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

A. downwards at its upper end

B. upwards at its upper end

C. perpendicular to the wall at its upper end

D. zero at its upper end

E. none of the above.

Explanation:

64. 69. The coefficient of friction depends on

A. area of contact

B. shape of surfaces

C. strength of surfaces

D. nature of surface

E. all of the above.

Explanation:

65. 1# Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one

A. ellipse

B. hyperbola

C. parabola

D. circle

E. none of the above.

Explanation:

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