Topic Menu

Cyber-chess a chess instruction site

Questions on Pressure

Q1. Two syringes are connected together as shown in the diagram below.

A force of 20 N is applied to the piston in syringe A.

(a) Calculate the pressure that the piston in syringe A exerts on the oil.

P = F/A

P = (20 N)/ (0.5 cm2)

a mark for recalling the equation

P = 40 N cm-2

(3 marks)

(b) Calculate the force needed to just prevent the piston in syringe B from moving out.

P = F/A

So F = PA

a mark for rearranging the equation

F = 40 x 5 = 200 N

(3 marks)

Maximum 6 marks