4-2.Friction
medium

$0.1 \,kg$ ના બ્લોક અને દીવાલ વચ્ચેનો ઘર્ષણાંક $0.5$ છે.તો બ્લોક પર ........ $N$ ઘર્ષણબળ લાગતું હશે.

A

$2.5$

B

$0.98$

C

$4.9$

D

$0.49$

(IIT-1994)

Solution

(b) Limiting friction ${F_l} = {\mu _s}R = 0.5 \times (5) = 2.5\;N$

Since downward force is less than limiting friction therefore block is at rest so the static force of friction will work on it.

${F_s}$ $=$ downward force $=$ Weight

$ = 0.1 \times 9.8 = 0.98\,N$

Standard 11
Physics

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