# Power

In this lesson we will be looking at what defines the power of an object, and how to calculate power.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, letâ€™s see what you can remember from this topic. Hereâ€™s a quick quiz!

Q1.Which is the correct statement about closed systems?

1/6

Q2.Which factors will affect the elastic potential energy store? (select two)

Select two (2) boxes

2/6

Q3.If the extension of a spring is doubled, what effect will this have on the elastic potential energy stored?

3/6

Q4.What is the elastic potential of an object with spring constant k = 10 N/m that has an extension of 0.5 m

4/6

Q5.A bungee jumper starts with 500 J in their GPE store. After they jump they fall and are brought to a stop with the bungee cord. With the cord fully stretched what is the energy in the EPE store?

5/6

Q6.HT only: What is the spring constant of a spring that stores 50 J of energy when extended by 10 cm

6/6

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, letâ€™s see what you can remember from this topic. Hereâ€™s a quick quiz!

Q1.Which is the correct statement about closed systems?

1/6

Q2.Which factors will affect the elastic potential energy store? (select two)

Select two (2) boxes

2/6

Q3.If the extension of a spring is doubled, what effect will this have on the elastic potential energy stored?

3/6

Q4.What is the elastic potential of an object with spring constant k = 10 N/m that has an extension of 0.5 m

4/6

Q5.A bungee jumper starts with 500 J in their GPE store. After they jump they fall and are brought to a stop with the bungee cord. With the cord fully stretched what is the energy in the EPE store?

5/6

Q6.HT only: What is the spring constant of a spring that stores 50 J of energy when extended by 10 cm

6/6

# 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 â€˜Resume Videoâ€™ 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 â€˜Nextâ€™ below.

Quiz:

# Power

This quiz will test your understanding of the content from the power lesson, and earlier lessons in this topic

Q1.Which of these is the correct definition of power?

1/5

Q2.Which is the correct statement about closed systems?

2/5

Q3.What is the power of a motor that transfers 450 J of energy in 9 s?

3/5

Q4.A ball dropped from a cliff has 100 J in its GPE store as it is released. What is the value of the KE store when it just reaches the ground?

4/5

Q5.How long would it take a 400 W motor to transfer 2000 J of energy?

5/5

Quiz:

# Power

This quiz will test your understanding of the content from the power lesson, and earlier lessons in this topic

Q1.Which of these is the correct definition of power?

1/5

Q2.Which is the correct statement about closed systems?

2/5

Q3.What is the power of a motor that transfers 450 J of energy in 9 s?

3/5

Q4.A ball dropped from a cliff has 100 J in its GPE store as it is released. What is the value of the KE store when it just reaches the ground?

4/5

Q5.How long would it take a 400 W motor to transfer 2000 J of energy?

5/5

# Lesson summary: Power

## 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