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Questions on Pressure

Q6.

Karen wants to pump up her car tyre.

Her pump has a piston with an area of cross-section of 7 cm2. Karen pushes the handle down with a force of 175 N.

(a) What pressure does she exert on the air in the pump?

(2 marks)

(b) The air pressure in the tyre is 27 N/cm2.

What pressure would be needed in the pump in order to pump more air into the tyre?

(1 mark)

(c) Another of Karen's car tyres exerts a pressure of 30 N/cm2 on the road.

The area of the tyre in contact with the road is 95 cm2

What is the force exerted by the tyre on the road?

(3 marks)

Total 6 marks