Physics Worksheet - Half-Yearly Examination - Kullegg Maria Regina Boys' Secondary School - 2013-2014 Page 8
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9f) Which valve needs to be used to lower the car after it is lifted?
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g) Why are liquids used in hydraulic systems?
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h) If bubbles of air are trapped inside the oil, the system would not work properly.
Explain why.
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i) What is the main advantage of using a hydraulic machine?
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j) Name one other example where hydraulic machines are useful.
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8.
This question is about moments.
a) Define moment.
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b) Nicholas is given a stand, a clamped nail, some weights, two hangers and a
metre rule. He needs to prove the principle (law) of moments.
(i) In the space below, draw a labelled diagram of how he should set up
the apparatus.
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Page 8 of 9
Physics Half yearly exam 2014 – Track 3 - Form 3
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