Physics Worksheet - Annual Examinations For Secondary Schools, 2015 Page 4
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125. a) Daniela and Thomas are carrying out an experiment on electrostatics.
i) Daniela argues that a neutral perspex (acetate) strip has no charges at all. Do you agree?
Explain.
_______________________________________________________________________________
____________________________________________________________________________ [2]
ii) When Daniela rubs the perspex strip with a cloth, it acquires a positive charge because
______________ are transferred from the ______________ to the ____________________ [3]
b) Lightning occurs when there is a very large amount of static electricity in clouds.
During a lightning strike the average current flowing is 45 000 A. The amount of
electric charge delivered during the strike is 5 C.
Figure 5
i) Calculate the duration of a lighting strike.
____________________________________________________________________________ [2]
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ii) Given that the energy dissipated is 6 × 10
J (600 000 000 J), calculate the voltage present.
_______________________________________________________________________________
____________________________________________________________________________ [3]
6. In the hydraulic jack shown in Figure 6, the lever
lever
is pushed down several times making the van
piston B
piston A
rise by a certain height each time. The valves
oil tank
allow the oil to flow in one direction.
valve 1
valve 2
a) State the advantage of using a hydraulic
system.
Figure 6
tap (closed)
_______________________________________________________________________________ [1]
b) Why are liquids used in hydraulic systems?
_______________________________________________________________________________ [2]
c) Which valve prevents the van from going down after it is lifted?
_______________________________________________________________________________ [1]
d) Predict what happens when the tap is opened.
_______________________________________________________________________________ [2]
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e) The area of piston A is 0.0004 m
while that of piston B is 8 m
. If the van’s mass is 2200 kg,
calculate:
i) the pressure exerted by the van on the liquid.
____________________________________________________________________________ [2]
ii) the force applied by the lever on piston A.
____________________________________________________________________________ [2]
Physics – Form 5 Secondary – Track 2 – 2015
Page 4 of 12
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