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Physics Worksheet - Half-Yearly Examination - Kullegg Maria Regina Boys' Secondary School - 2013-2014 Page 7

7. This question is about hydraulic machines.

Figure 2 shows a hydraulic jack. The handle is moved several times up and down. Each

time the pump piston is pushed down, the car rises a little bit. The valves allow oil to

flow in one direction.

pivot

handle

ram piston

pump piston

(Area = 8 m

)

(Area = 0.002 m

)

oil

reservoir

valve A

valve B

(closed)

(open)

Figure 2

valve C

(closed)

a) Calculate the pressure exerted by the pump piston when a force of 5 N is applied to it.

_______________________________________________________________

[2]

b) What is the pressure at the ram piston? Explain.

_______________________________________________________________

[2]

c) Calculate the force on the ram piston.

_______________________________________________________________

[2]

d) What keeps the car from going back down after it is lifted?

_______________________________________________________________

[1]

e) Why is the oil reservoir important?

_______________________________________________________________

[2]

Page 7 of 9

Physics Half yearly exam 2014 – Track 3 - Form 3

Physics Worksheet - Half-Yearly Examination - Kullegg Maria Regina Boys' Secondary School - 2013-2014 Page 7