The length of needle floating on water is 2 cm.what will be the addtional force required to pull needle out of water ? (surface tension of water = 7 x 10^-3 N/m)
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One will have to overcome the downward surface tension force in addition to its weight.
F
T
=2Tl∵There are two contact surfaces
⇒F
T
=2×0.072×2.5×10
−2
⇒
F
T
=3.6×10
−3
N
Note: Arrow in the diagram shows surface tension force.
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