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  4. A 0.5 kg ball moves in a circle of radius 0.4 m at a velocity of 4 m / s. The centripetal force on the ball is

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Q. A $0.5\, kg$ ball moves in a circle of radius $0.4\, m$ at a velocity of $4\, m / s$. The centripetal force on the ball is

ManipalManipal 2011Laws of Motion

Solution:

$F=\frac{m v^{2}}{r}$
$F=\frac{0.5 \times 4 \times 4}{0.4}$
$F =\frac{8.0}{0.4}$
$=\frac{80}{4}=20\, N$