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Questions on Pressure and Moments

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.

(3 marks)

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

(3 marks)

(b) The diagram below shows the brake pedal used to operate the brakes in a car.

The foot applies a force of 50 N.

(i) Calculate the force applied to the piston P.

(2 marks)

(ii) The brake fluid pushes another piston, Q, which is attached to the car's brakes. Piston Q has an area which is eight times larger than piston P. Calculate the force on the car's brakes.

(2 marks)

Maximum 12 marks