# Pressure

In this lesson we look at pressure. By the end of the lesson you should be able to say what pressure is, how to calculate it, and how we can use this knowledge in everyday situations.

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 7

Q1.The unit of force is

1/7

Q2.At least how many cogs are needed for a gear to work correctly?

2/7

Q3.Gears work by applying a turning force to one wheel. A interlocking wheel turns the adjacent wheel in which direction?

3/7

Q4.What prevents a gear from slipping?

4/7

Q5.A gear with a radius of 1 m creates a moment of 200 Nm. What could you assume the moment of the 2 m gear be?

5/7

Q6.How much will a 24 : 12 gear ratio speed up the rotation of a gear?

6/7

Q7.The moment about a 4 cm wheel is 8 Nm. What’s the moment about a 12 cm one?(Remember, the ratio of moments = ratio of radii)

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 7

Q1.The unit of force is

1/7

Q2.At least how many cogs are needed for a gear to work correctly?

2/7

Q3.Gears work by applying a turning force to one wheel. A interlocking wheel turns the adjacent wheel in which direction?

3/7

Q4.What prevents a gear from slipping?

4/7

Q5.A gear with a radius of 1 m creates a moment of 200 Nm. What could you assume the moment of the 2 m gear be?

5/7

Q6.How much will a 24 : 12 gear ratio speed up the rotation of a gear?

6/7

Q7.The moment about a 4 cm wheel is 8 Nm. What’s the moment about a 12 cm one?(Remember, the ratio of moments = ratio of radii)

7/7

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

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

Test your knowledge and understanding on the lesson 'Pressure'.

## Question 7

Q1.Recall the units for pressure.

1/7

Q2.Recall the equation for pressure

2/7

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

3/7

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

Select two (2) boxes

4/7

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

Select two (2) boxes

5/7

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

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?

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:

# Pressure

Test your knowledge and understanding on the lesson 'Pressure'.

## Question 7

Q1.Recall the units for pressure.

1/7

Q2.Recall the equation for pressure

2/7

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

3/7

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

Select two (2) boxes

4/7

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

Select two (2) boxes

5/7

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

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?

7/7

# Lesson summary: Pressure

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The next lesson in Forces is "Pressure in fluids"