Practice questions

1.Use the image below to answer the following question.

The total force at the surface of the fluid is 500N and this force occurs along a total surface area of 0.4m². Calculate the pressure.

Pressure = Force/Area

Pressure = 500N/0.4m²

Pressure = 1250Pa

2. Using the image below to answer the following question.

Add force arrows to the diagram above to show the pressure acting at the surface of the balloon.

Remember that both the air outside of the balloon and the air in the balloon act as a fluid. 

3. Use the image below to answer the following question

Identify all the possible places in the diagram above where force arrows should be drawn to represent the pressure acting at the surface of a fluid.

Force arrow from air pointing down onto water

Force arrow from water pointing up to sky

Force arrow pointing from air onto sand, leaves and trees