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4.2 friction — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.2 friction1 Mark
MCQ
A block is lying on an inclined plane which makes $60^°$ with the horizontal. If coefficient of friction between block and plane is $0.25$ and $g = 10\,m/{s^2}$, then acceleration of the block when it moves along the plane will be ........ $m/s^2$
  • A
    $2.50$
  • B
    $5.00$
  • ✓
    $7.4$
  • D
    $8.66$
✓

Answer

Correct option: C.
$7.4$
c
(c) $a = g(\sin \theta - \mu \cos \theta )$ $ = 10(\sin 60^\circ - 0.25\cos 60^\circ )$
$a = 7.4\;m/{s^2}$

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