A body of weight 50 ,N placed on a horizontal surface is just moved by a force of 28.2, N . friction

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4-2.Friction

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A body of weight $50 \,N$ placed on a horizontal surface is just moved by a force of $28.2\, N$. The frictional force and the normal reaction are

A

$10 \,N, 15 \,N$

B

$20\, N, 30\, N$

C

$2 \,N, 3 \,N$

D

$5 \,N, 6\, N$

Solution

(b) Frictional force = $f = 28.2\cos 45^\circ $ $ = 28.2 \times \frac{1}{{\sqrt 2 }} = 20\;N$

Normal reaction $R = 50 – 28.2\sin 45^\circ $$ = 30\;N$

Standard 11

Physics

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