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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 $10\, kg$ is placed on a rough horizontal surface having coefficient of friction $\,\mu  = 0.5$. If a horizontal force of $100\, N$ is acting on it, then acceleration of the block will be ....... $m/s^2$
  • A
    $0.5$
  • ✓
    $5$
  • C
    $10$
  • D
    $15$
✓

Answer

Correct option: B.
$5$
b
$(b)$ $a = \frac{{{\rm{Applied\, force - Kinetic \,friction}}}}{{{\rm{mass}}}}$ $ = \frac{{100 - 0.5 \times 10 \times 10}}{{10}} = 5m/{s^2}$

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