Pressure in fluids

In this lesson, we concentrate on pressure in fluids, and in particular how pressure changes in liquids. By the end of the lesson you will be able to calculate pressure in a column of water, and also explain why objects sink or float.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Q1.Recall the units for pressure.

Newtons Pascals Joules Kilograms Newton-metres

1/7

Q2.Recall the equation for pressure

p = F x A p = A / F p = F / A P = F + A

2/7

Q3.The pressure in fluids causes a force at what angle to a surface?

45 degrees 90 degrees 120 degrees 180 degrees 360 degrees

3/7

Q4.Identify all the things you could do to reduce the pressure exerted on a surface.

Select two (2) boxes

Increase the force Decrease the surface area Increase the surface area Decrease the force

4/7

Q5.Identify all things you could do to increase the pressure exerted on a surface.

Select two (2) boxes

Increase the force Decrease the surface area Increase the surface area Decrease the force Decrease the temperature Increase the temperature

5/7

Q6.A force of 2000 N acts over an area of 10 metre squared. Calculate the pressure.

2 Pa 20 Pa 200 Pa 2000 Pa 20000 Pa

6/7

Q7.An elephant creates 12000 Pa of pressure on its four feet, which have a total area of 3 metres squared. What is the weight of the elephant?

36000 Kg 36000 N 4000 Kg 4000 N

7/7

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Q1.Recall the units for pressure.

Newtons Pascals Joules Kilograms Newton-metres

1/7

Q2.Recall the equation for pressure

p = F x A p = A / F p = F / A P = F + A

2/7

Q3.The pressure in fluids causes a force at what angle to a surface?

45 degrees 90 degrees 120 degrees 180 degrees 360 degrees

3/7

Q4.Identify all the things you could do to reduce the pressure exerted on a surface.

Select two (2) boxes

Increase the force Decrease the surface area Increase the surface area Decrease the force

4/7

Q5.Identify all things you could do to increase the pressure exerted on a surface.

Select two (2) boxes

Increase the force Decrease the surface area Increase the surface area Decrease the force Decrease the temperature Increase the temperature

5/7

Q6.A force of 2000 N acts over an area of 10 metre squared. Calculate the pressure.

2 Pa 20 Pa 200 Pa 2000 Pa 20000 Pa

6/7

Q7.An elephant creates 12000 Pa of pressure on its four feet, which have a total area of 3 metres squared. What is the weight of the elephant?

36000 Kg 36000 N 4000 Kg 4000 N

7/7

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Worksheet

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Pressure in Fluids

This quiz will assess your knowledge and understanding of the lesson 'pressure in fluids'.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Q1.Recall the units for pressure.

Newtons Pascals Joules Kilograms Newton-metres

1/6

Q2.What happens to pressure with an increased depth of a liquid?

Decreases Increases Stays the same Dissipates

2/6

Q3.Identify the force that is the upward force that a fluid exerts on a body floating in it.

Friction Tension Upthrust Air resistance Weight

3/6

Q4.Which of the following explains why an object may sink in water?

The weight of the object is less than the weight of the water displaced The weight of the object is greater than the weight of the water displaced The weight of the object is equal to the weight of the water displaced The weight of the object causes no water to be displaced

4/6

Q5.Which of the following explains why an object may float in water?

5/6

Q6.A small dam has a wall of 50 m. Calculate the pressure exerted by the water at the bottom of the dam. (g = 10 N/kg, density of water = 1000 kg/m³)

200 Pa 500 Pa 5000 Pa 200000 Pa 500000 Pa

6/6

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Pressure in Fluids

This quiz will assess your knowledge and understanding of the lesson 'pressure in fluids'.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Q1.Recall the units for pressure.

Newtons Pascals Joules Kilograms Newton-metres

1/6

Q2.What happens to pressure with an increased depth of a liquid?

Decreases Increases Stays the same Dissipates

2/6

Q3.Identify the force that is the upward force that a fluid exerts on a body floating in it.

Friction Tension Upthrust Air resistance Weight

3/6

Q4.Which of the following explains why an object may sink in water?

4/6

Q5.Which of the following explains why an object may float in water?

5/6

Q6.A small dam has a wall of 50 m. Calculate the pressure exerted by the water at the bottom of the dam. (g = 10 N/kg, density of water = 1000 kg/m³)

200 Pa 500 Pa 5000 Pa 200000 Pa 500000 Pa

6/6

Lesson summary: Pressure in fluids

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