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GCSE Questions: Pressure, buoyancy, upthrust and fluids

Q2. The diagram shows a container filled with water. The three holes in the side of the container are sealed with rubber stoppers.

(a) The water exerts a force of 27 N on the bottom of the container.

The cross-sectional area of the bottom of the container is 0.009 m2.

Calculate the pressure exerted by the water on the bottom of the container.

Pressure = Force/Contact area

Pressure = 27/0.009

Pressure = 3,000 Pa (or N/m)

[4 marks]

(b) The container is put under running water from a tap and the three rubber stoppers removed.

The diagram below shows the path taken by the water escaping from the top and bottom holes.

(i) Complete the above diagram to show the path taken by the water escaping from the centre hole.

[1 mark]

(ii) What can be concluded from the diagram about the pressure in a liquid?

Pressure increases with depth or when the pressure is higher, the water travels further

[1 mark]

(c) The diagram below shows a simple model of a liquid.

When a force pushes down on the marbles, the marbles push the sides and bottom of the container outwards.

What can be concluded from this model about the pressure in a liquid?

Pressure acts in all directions or pressure causes a force on all of the surfaces

[1 mark]

 

[7 Marks TOTAL]