Laws of Motion-Laws of Friction (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 2 of 2

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Question number: 1

» Laws of Motion » Laws of Friction

Appeared in Year: 2010

MCQ▾

Question

A pen of mass ‘m’ is laying on a piece of paper of mass M placed on a rough table. If the coefficient of friction between the pen and paper, and, the paper and table are μ1 and μ2, respectively, then the minimum horizontal force with which the paper has to be pulled for the pen to start slipping is given by-

Choices

Choice (4) Response
a.

m(μ1+μ2)g

b.

(mμ1+Mμ2)g

c.

(m+M)(μ1+μ2)g

d.

{mμ1+(m+M)μ2}g

Question number: 2

» Laws of Motion » Laws of Friction

Appeared in Year: 2013

MCQ▾

Question

A plank is resisting on a horizontal ground in the northern hemispherical of the Earth at a 450 latitude. Let the angular speed of the Earth be ω and its radius re. The magnitude of the frictional force on the plank will be,

Choices

Choice (4) Response
a.

mreω2

b.

mreω22

c.

mreω22

d.

Zero

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