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 Form 1 Physics Questions and Answers on Force

(a) Define surface tension.
(b)How does temperature rise and impurities affect the surface tension of water?
(c) How would the surface tension of water be increased?

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Answer Text:
(a) This is the force that causes the surface of water to act like a fully stretched thin elastic skin
(b) Temperature - Temperature rise causes a rise in kinetic energy therefore weakening the force of attraction between water molecules hence lowering the surface tension.
Impurities - Impurities weaken the force of attraction between water molecules hence lowering the surface tension.
(c) Lowering the temperature of water.


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