# Conservation of energy

In this lesson we will be studying the law of conservation of energy with a focus on conservation of energy during transfers between the kinetic store and gravitational potential energy store.

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 energy store is increased when an object is stretched?

1/6

Q2.What is the definition of the gravitational potential energy store?

2/6

Q3.Which is the correct equation linking gravitational field strength, gravitational potential energy, height and mass

3/6

Q4.What effect would doubling the mass of an object have on its store of GPE?

4/6

Q5.What is the value of the GPE store for a 10 kg object held 50 m above the surface of the Earth (assume g = 10 N/kg)?

5/6

Q6.How can a 500 kg object have the same value for its GPE store on the Moon as it does on the Earth?

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 energy store is increased when an object is stretched?

1/6

Q2.What is the definition of the gravitational potential energy store?

2/6

Q3.Which is the correct equation linking gravitational field strength, gravitational potential energy, height and mass

3/6

Q4.What effect would doubling the mass of an object have on its store of GPE?

4/6

Q5.What is the value of the GPE store for a 10 kg object held 50 m above the surface of the Earth (assume g = 10 N/kg)?

5/6

Q6.How can a 500 kg object have the same value for its GPE store on the Moon as it does on the Earth?

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:

# Conservation of energy

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

Q1.Which is the correct statement about closed systems?

1/6

Q2.A box is pushed along the ground. Which energy transfer is involved?

2/6

Q3.What is the definition of the gravitational potential energy store?

3/6

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?

4/6

Q5.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 is half way to the ground?

5/6

Q6.What is the maximum height reached for an object of mass 1 kg launched upwards at a speed of 20 m/s (g = 10 N/kg)

6/6

Quiz:

# Conservation of energy

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

Q1.Which is the correct statement about closed systems?

1/6

Q2.A box is pushed along the ground. Which energy transfer is involved?

2/6

Q3.What is the definition of the gravitational potential energy store?

3/6

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?

4/6

Q5.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 is half way to the ground?

5/6

Q6.What is the maximum height reached for an object of mass 1 kg launched upwards at a speed of 20 m/s (g = 10 N/kg)

6/6

# Lesson summary: Conservation of energy

## Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Chair yoga