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4.2 friction — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.2 friction1 Mark
MCQ
A block of mass $1\,kg$ lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is $0.6$ . If the acceleration of the truck is $5\,m\,s^{-2}$ . The frictional force acting on the block is ........ $N$ 
  • A
    $10$
  • ✓
    $5$
  • C
    $2.5$
  • D
    $20$
✓

Answer

Correct option: B.
$5$
b
Limiting friction, $F=\mu \mathrm{mg}$

$=0.6 \times 1 \times 9.8$

$=5.88 \mathrm{N}$

Applied force, $F=\mathrm{ma}=1 \times 5=5 \mathrm{N}$

As $\mathrm{F}<\mathrm{f},$ so force of friction $=5 \mathrm{N}$

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