Doesn't physics just bowl you over?

Classical Mechanics Level 2

Here's a neat trick . If each ceramic bowl has a mass of 200 g, what is the difference in Newtons between the weight of the bowls on the top of her head before and after she does the trick?

Details and assumptions

  • The acceleration of gravity is 9.8 m/s 2 9.8~\mbox{m/s}^2 in vertically downward direction.


The answer is 9.8.

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David Mattingly by David Mattingly

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2 solutions

Clifford Wilmot
Dec 17, 2013

There are 5 5 bowls, so the total mass is 0.2 k g × 5 = 1 k g 0.2~kg\times 5=1~kg . W = m g = 1 × 9.8 = 9.8 N W=mg=1\times9.8=9.8~N .

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there are 5 bowls on her foot. so 5 0.2 9.8= 9.8

andre yudhistika - 7 years, 5 months ago
Akshat Mallya
Jan 22, 2014

Let the original weight of the bowls be x x

We see that the woman has added 5 extra bowls to the existing weight ( x ) (x)

And we know, the mass of one bowl=0.2kg

(Weight=mg & g= 9.8 m / s 2 9.8m/s^{2}

So increase in wt.(F)

F = x + ( 0.2 × 5 ) g − x F= x+ (0.2 \times 5)g -x

= 9.8 N \boxed{9.8 N}

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