Remote Learning Do Now I Do We Do You Do

Expectations: Listen to the audio and pause when asked to complete the tasks.• I do – The teacher will show you an example: You watch• We do – The teacher will help you: You try and quiz yourself• You do – Independent work: You answer the questions by yourself using

what you have learntMark your answers in red pen and add corrections.

Do Now – 10 minutes (Pause the video while you complete the do now).

1. What charge do protons, neutrons and electrons have? 2. What does an omnivore eat? 3. What is the process called when a solid changes state to a liquid? 4. Define diffusion5. What is used to view cells? 6. What planet is furthest from the sun?

Lesson title: Year 7 Science – The Speed of Sound

For this lesson, you will need:• A blue or black pen• A red pen• A ruler• A calculator

Remote Learning Do Now I Do We Do You Do

Expectations: Listen to the audio and pause when asked to complete the tasks.• I do – The teacher will show you an example: You watch• We do – The teacher will help you: You try and quiz yourself• You do – Independent work: You answer the questions by yourself using what you have learntMark your answers in red pen and add corrections.

Do Now – Mark and correct in red pen – 2 minutes

1. What charge do protons, neutrons and electrons have? Protons – positive, neutrons – neutral, electrons - negative2. What does an omnivore eat? Both other animals (meat) and plants3. What is the process called when a solid changes state to a liquid? Melting4. Define diffusion The movement of particles from an area of high concentration to low concentration5. What is used to view cells? A microscope6. What planet is furthest from the sun? Neptune

Lesson title: Year 7 Science – The Speed of Sound

Remote Learning Do Now I Do We Do You Do

Lesson title: Year 7 Science – The Speed of Sound

Glossary:

Wave – Transfers energy from one place to another

Longitudinal – Vibrations are parallel to the direction of energy transfer

Sound – vibrations that travel through a medium and heard when they reach a person or animals ear

Speed – The rate at which something moves

Remote Learning Do Now I Do We Do You Do

I do – You watch

Sound waves are caused by vibrating objects.

Sound waves are an example of longitudinal waves.

When an object vibrates, it makes the surrounding air particles vibrate.This is how sound waves travel. The air particles squash together and spread out.

Sound travels faster in solids then liquids and faster in liquids then gases.

Sound waves can’t travel without particles. Soundtherefore, needs a medium to travel such as a solid, liquid or gas.

Substance Speed of sound

Air 343 m/s

Water 1493 m/s

Steel 5130 m/s

The speed of sound depends on what it’s passing through.The more particles there are, the faster a sound wave travels.Dense mediums like solids, have a lot of particles in a small space, so sound travels faster in solids.

Sound cannot travel in space, because it’s mostly a vacuum (there are no particles).

Remote Learning Do Now I Do We Do You Do

I do – You watch

Speed of soundAlthough sound travels quite fast, it is still possible to measure its speed in air.

To do this, you need to measure the time it takes a sound to travel a measured distance.

Using microphones and data loggerA data logger can measure and record the time taken for sound to reach two microphones. Unlike the clap-echo method, these can be quite close together.

You can give this method a try at home

Sound travels much slower then light!

Clap-echo methodThis method involves measuring the time taken for you to hear an echo from a sharp clap. You stand a long distance from a wall, clap, and listen for the echo. The distance travelled is twice the distance from you to the wall (because the soundhas to travel to the wall and back).

Remote Learning Do Now I Do We Do You Do

I do – You watch

We can measure the speed of soundusing the following equation:

Distance is measured in meters (m)Time is measured in seconds (s)Speed is measured in meters per second (m/s)

For example:

Two microphones are 3.4 m apart. The data logger recorded a time of 0.01s for the sound to travel between the microphones.

What was the speed of the sound?

Speed = distance ÷ time= 3.4 ÷ 0.01 = 340 m/s

A student stands 50 m away from a wall. They clap their hands and hear the echo after 20 s.

What was the speed of the sound?

Speed = distance ÷ time= 50 ÷ 20 = 2.5 m/s

Remote Learning Do Now I Do We Do You Do

We do: Quiz yourself – Answer the following multiple choice questions (5 minutes)

1. What type of waves are sound waves?

a) Water

b) Longitudinal

c) Transverse

2. In which does sound travel fastest?

a) Liquids

b) Solids

c) Gases

3. What can sound NOT travel in?

a) Vacuum

b) Liquids

c) Gases

4. What is the unit for speed?

a) Seconds

b) Meters

c) Meters per second

5. Which waves are fastest?

a) Light

b) Sound

c) Water

6. What is the speed if a sound travels 300m in 60s?

a) 5m

b) 5m/s

c) 10m/s

Remote Learning Do Now I Do We Do You Do

1. What type of waves are sound waves?

a) Water

b) Longitudinal

c) Transverse

2. In which does sound travel fastest?

a) Liquids

b) Solids

c) Gases

3. What can sound NOT travel in?

a) Vacuum

b) Liquids

c) Gases

4. What is the unit for speed?

a) Seconds

b) Meters

c) Meters per second

5. Which waves are fastest?

a) Light

b) Sound

c) Water

6. What is the speed if a sound travels 300m in 60s?

a) 5m

b) 5m/s

c) 10m/s

We do: mark your answers and make corrections in red pen.

Remote Learning Do Now I Do We Do You Do

We do: Quiz yourself – Can you spot the mistakes? (5 minutes)

1. Sound waves are caused by moving objects.

Sound waves are an example of transverse waves.

When an object vibrates, it makes the surrounding air particles move.

Sound waves can travel without particles. Sound therefore, doesn’t need a medium to travel such as a solid, liquid or gas.

The more particles there are, the faster a sound wave travels.

Sound can travel in space, because it’s mostly a vacuum (there are no particles).

2. A sound travelled 75m in 25s.

What was the speed of the sound?

Speed = distance ÷ time= 25 ÷ 75 = 0.33m/s

Remote Learning Do Now I Do We Do You Do

1. Sound waves are caused by vibrating objects.

Sound waves are an example of longitudinal waves.

When an object vibrates, it makes the surrounding air particles vibrate.

Sound waves can’t travel without particles. Sound therefore, needs a medium to travel such as a solid, liquid or gas.

The more particles there are, the faster a sound wave travels.

Sound cannot travel in space, because it’s mostly a vacuum (there are no particles).

2. A sound travelled 75m in 25s.

What was the speed of the sound?

Speed = distance ÷ time= 75 ÷ 25 = 3m/s

We do: mark your answers and make corrections in red pen.

Remote Learning Do Now I Do We Do You Do

You do: Independent task (about 10 minutes of work)

2.1.

3.

4.

If a sound travelled 50 meters in 15 seconds, what was its speed?

A man heard a dog bark who was 75 meters away. The bark took 5 seconds to reach the man. Was the speed of the bark?

5.

Remote Learning Do Now I Do We Do You Do

2.1.

3.

4.

If a sound travelled 50 meters in 10 seconds, what was its speed?Speed = distance / time Speed = 50 / 10 Speed = 5 m/s

A man heard a dog bark who was 75 meters away. The bark took 5 seconds to reach the man. Was the speed of the bark?Speed = distance / time Speed = 75 / 5 Speed = 15 m/s

5.

Jan was the furthest away.The further the sound travels the quieter it gets.

Solids

As waves or vibrations

It vibrates

You do: Mark your answers and make corrections in red pen

Remote Learning Do Now I Do We Do You Do

For further assistance from the Science team –

Contact Ms. Anna Law – our Head of KS3 Science at:

a.law@harrisgreenwich.org.uk