# Moments and work revision

In this lesson we come back to key content such as balancing moments, changing units, rounding to 3 significant figures and using the work done and power equations.

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 9

Q1.For an object with a larger spring constant, the force required to stretch it would be

1/9

Q2.This means more work is done so the energy stored in the spring is

2/9

Q3.For an object with a smaller spring constant the force required to stretch or compress it is

3/9

Q4.This means less work is done so the energy stored in the spring is

4/9

Q5.In a bow and arrow, when we let go of the string, the energy is transferred from the elastic potential store to the

5/9

Q6.Use Hooke's Law: Force = Spring constant x extension to calculate the force required to stretch a 5 N/m spring to 2 m

6/9

Q7.Use Hooke's Law: Force = Spring constant x extension to calculate the force required to stretch a 0.5 N/m spring to 4 m

7/9

Q8.Use Hooke's Law: Force = Spring constant x extension to calculate the extension produced if a force of 10 N is exerted on a spring with a constant of 5 N/m

8/9

Q9.Use Hooke's Law: Force = Spring constant x extension to calculate the spring constant if an extension of 4 m is produced with a force of 32 N.

9/9

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 9

Q1.For an object with a larger spring constant, the force required to stretch it would be

1/9

Q2.This means more work is done so the energy stored in the spring is

2/9

Q3.For an object with a smaller spring constant the force required to stretch or compress it is

3/9

Q4.This means less work is done so the energy stored in the spring is

4/9

Q5.In a bow and arrow, when we let go of the string, the energy is transferred from the elastic potential store to the

5/9

Q6.Use Hooke's Law: Force = Spring constant x extension to calculate the force required to stretch a 5 N/m spring to 2 m

6/9

Q7.Use Hooke's Law: Force = Spring constant x extension to calculate the force required to stretch a 0.5 N/m spring to 4 m

7/9

Q8.Use Hooke's Law: Force = Spring constant x extension to calculate the extension produced if a force of 10 N is exerted on a spring with a constant of 5 N/m

8/9

Q9.Use Hooke's Law: Force = Spring constant x extension to calculate the spring constant if an extension of 4 m is produced with a force of 32 N.

9/9

# 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.

Quiz:

# Moments and Work Revision

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

## Question 11

Q1.What is the moment of a force?

1/11

Q2.For an object to be balanced, the clockwise moment must equal the .......

2/11

Q3.How can we make the moment bigger (choose 2)

Select two (2) boxes

3/11

Q4.Work done means

4/11

Q5.Power is the .......

5/11

Q6.What does rate mean?

6/11

Q7.What is 400 cm in m?

7/11

Q8.What is 0.3 km in m?

8/11

Q9.What is the unit of power?

9/11

Q10.What is the unit of energy or work done?

10/11

Q11.What is the power if 30 J of energy is transferred in 10 seconds?

11/11

Quiz:

# Moments and Work Revision

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

## Question 11

Q1.What is the moment of a force?

1/11

Q2.For an object to be balanced, the clockwise moment must equal the .......

2/11

Q3.How can we make the moment bigger (choose 2)

Select two (2) boxes

3/11

Q4.Work done means

4/11

Q5.Power is the .......

5/11

Q6.What does rate mean?

6/11

Q7.What is 400 cm in m?

7/11

Q8.What is 0.3 km in m?

8/11

Q9.What is the unit of power?

9/11

Q10.What is the unit of energy or work done?

10/11

Q11.What is the power if 30 J of energy is transferred in 10 seconds?

11/11

# Lesson summary: Moments and work revision

### Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga

### Take part in The Big Ask.

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