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Form 3 Physics - Boys'' Secondary Mosta Half-Yearly Examinations - Kullegg Maria Regina, 2012 Page 8

This question is about hydraulic machines.

Figure 5 shows a simple hydraulic machine used to compress polystyrene

(jablo). When a force is applied on piston A, a much larger force is created on

piston B which is then used to compress the polystyrene.

polystyrene

(jablo)

Piston A

Oil

(0.01 m

)

Piston B

Figure 5

(0.4 m

)

a) Underline the correct answer.

As the polystyrene is compressed, its:

(i)

volume (increases, decreases, remains the same).

[1]

(ii)

density (increases, decreases, remains the same).

[1]

(iii) mass (increases, decreases, remains the same).

[1]

b) (i) Calculate the pressure exerted by piston A, when a force of 60 N is

applied on it.

__________________________________________________________ [3]

(ii) What is the value of the pressure at piston B? Explain.

__________________________________________________________ [2]

(iii) Calculate the force used to compress the polystyrene.

__________________________________________________________

__________________________________________________________ [3]

(iv) What is the advantage of using a hydraulic machine?

__________________________________________________________ [2]

(v) If bubbles of air are trapped inside the oil, the system does not work. Why?

__________________________________________________________ [2]

END OF PAPER

Page 8 of 8

Physics Half yearly exam 2012 – Track 3 - Form 3

Form 3 Physics - Boys'' Secondary Mosta Half-Yearly Examinations - Kullegg Maria Regina, 2012 Page 8