# AQA GCSE Physics Atmospheric Pressure

## Resources

1. The specification is very helpful indeed – From Page 48. https://filestore.aqa.org.uk/resources/physics/specifications/AQA-8463-SP-2016.PDF
2. The BBC Bitesize website is also very good – https://www.bbc.co.uk/bitesize/guides/z93dxfr/revision/1

## Questions

1. Write a sentence to explain what the atmosphere is?
2. What happens to the density of the atmosphere with increasing altitude?
3. How do air molecules cause atmospheric pressure?
4. Copy the following paragraph filling in the blanks. The specification will help you.

The number of air molecules (and so the _________ of air) above a surface __________ as the height of the surface above________ level increases. So as ___________ increases there is always _____________r above a surface than there is at a lower height. So atmospheric pressure decreases with an increase in __________.

# AQA GCSE Physics Pressure in a fluid 2 (HT only)

## Resources

1. The specification is very helpful indeed – From Page 48. https://filestore.aqa.org.uk/resources/physics/specifications/AQA-8463-SP-2016.PDF
2. The BBC Bitesize website is also very good – https://www.bbc.co.uk/bitesize/guides/z93dxfr/revision/1

## Questions

1. How can the pressure due to a column of liquid be calculated?
2. What are the units of height?
3. What are the units of density?
4. What is the unit of pressure?
5. What are the units for gravitational field strength?
6. Can you rearrange the equation for dentistry, height and gravitational field strength?
7. How does the pressure at the bottom of a column of liquid compare to the pressure at the top?
8. A partially (or totally) submerged object experiences a greater pressure on the bottom surface than on the top surface. What direction is the resultant force on the object?
9. Write down the definition of resultant force? Can you draw a diagram to show the situation described in Q8?
10. What is this resultant force called?
11. What are the factors that affect floating and sinking?

# AQA GCSE Physics Pressure in a fluid 1

## Resources

1. The specification is very helpful indeed – From Page 48 https://filestore.aqa.org.uk/resources/physics/specifications/AQA-8463-SP-2016.PDF
2. The BBC Bitesize website is also very good – https://www.bbc.co.uk/bitesize/guides/z93dxfr/revision/1

## Questions

1. Can a fluid be a gas?
2. Draw a diagram to illustrate ‘The pressure in fluids causes a force normal (at right angles) to any surface’.
3. Write down an equation to calculate the pressure at a surface.
4. What are the units of pressure?
5. Give an alternative unit for pressure?
6. What is the unit for the area?
7. What is the unit for force?
8. Rearrange the equation so the force is the subject of the equation.
9. Rearrange the equation so that area is the subject of the equation.