First slide

Surface tension and surface energy

Question

A wooden stick 2m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be

Moderate

A

0.07 N
B

0.06 N
C

0.01 N
D

0.02 N

Solution

Net force on stick $= F_{1} - F_{2} = (T_{1} - T_{2}) l$
$= (0 .07 - 0 .06) l = 0 .01 \times 2 = 0 .02 N$

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