Form 3 Physics - Boys'' Secondary Mosta Half-Yearly Examinations - Kullegg Maria Regina, 2016 Page 6
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105. This question is about hydraulic machines.
A driver applies a force with his foot on the brake pedal as shown in Figure 5. (The
diagram is not to scale).
piston A
oil
piston B
brake
pad
steel disc
Figure 5
a) Use the words below to fill in the blanks:
compressible
large
incompressible
transmitted
small
In hydraulic machines, oil is used since liquids are _______________________.
The
pressure in the oil is _______________________ equally in all directions.
If air bubbles are
trapped in the oil, the brakes do not work well because air is _______________________.
The advantage of hydraulic machines is that they can turn a _______________________ force
into a _______________________ force.
[5]
2
b) A force of 50 N is applied on piston A which has an area of 0.4 cm
.
(i) Calculate the pressure exerted by piston A.
______________________________________________________________________________
______________________________________________________________________________
[1]
(ii) What is the pressure exerted on piston B?
[1]
______________________________________________________________________________
(iii) Calculate the force exerted by each braking pad on the steel disc given that the area of
2
piston B is 20 cm
.
______________________________________________________________________________
[1]
______________________________________________________________________________
Page 6 of 10
Physics Half yearly exam 2016– Track 3 - Form 3
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