Physics 3Physics 3

Gravity and SpaceGravity and Space

C/WC/W Earth, Moon & SunEarth, Moon & Sun 18 Apr 202318 Apr 2023

Aims:-Aims:- 4 know how they move in space4 know how they move in space

5 describe their path across the sky5 describe their path across the sky

6 explain the phases of the Moon6 explain the phases of the Moon

Starter – 5 minutesStarter – 5 minutes How does the laptop look to John?How does the laptop look to John?

Animation 1Animation 1

Day and NightDay and Night

Copy notes – 5 minutesCopy notes – 5 minutes

Earth turns on its axisEarth turns on its axisThis causes day and nightThis causes day and night It takes 24 hoursIt takes 24 hours

The Sun seems to move across the skyThe Sun seems to move across the sky It is always towards the SouthIt is always towards the South It appears in the East in the morningIt appears in the East in the morning It disappears in the West at nightIt disappears in the West at night It is high up at mid-dayIt is high up at mid-day It is lower in winterIt is lower in winter

Copy diagrams – 10 minutesCopy diagrams – 10 minutes

Page 133 (top)Page 133 (top)

Page 135 (top)Page 135 (top)

Animation 2Animation 2

SeasonsSeasons

(open seasons.swf)(open seasons.swf)

Copy notes – 5 minutesCopy notes – 5 minutes

Earth orbits the Sun, like all planetsEarth orbits the Sun, like all planets It takes 1 year (365¼ days)It takes 1 year (365¼ days)

The rotation axis is tiltedThe rotation axis is tilted It is always tilted the same wayIt is always tilted the same wayThis causes the seasonsThis causes the seasonsThe North is tilted towards the Sun in JuneThe North is tilted towards the Sun in JuneThis is our summer timeThis is our summer timeThe South is tilted away so they have WinterThe South is tilted away so they have Winter

Copy diagrams – 10 minutesCopy diagrams – 10 minutes

Page 134 (middle)Page 134 (middle)

Page 134 (bottom-left)Page 134 (bottom-left)

Animation 3Animation 3

Moon PhasesMoon Phases

The Moon – 10 minutesThe Moon – 10 minutes

The Moon orbits the Earth in 28 daysThe Moon orbits the Earth in 28 days It looks different each day of the month It looks different each day of the month

depending on how much of it is lit up by depending on how much of it is lit up by the Sunthe Sun

Copy diagram on top of p136Copy diagram on top of p136

HomeworkHomework

Look at the moon tonightLook at the moon tonightDraw the shape of the moon in your book Draw the shape of the moon in your book

(with a proper title and heading of course)(with a proper title and heading of course)Extra:Extra:Look at the moon every hour until bedtimeLook at the moon every hour until bedtimeHow does it move across the sky?How does it move across the sky?Project:Project: Measuring the size of the EarthMeasuring the size of the Earth

Are You On Target Today?Are You On Target Today?

Aims:-Aims:- 4 know how they move in space4 know how they move in space

5 describe their path across the sky5 describe their path across the sky

6 explain the phases of the Moon6 explain the phases of the Moon

C/WC/W Solar SystemSolar System 18 Apr 202318 Apr 2023

Aims:-Aims:- 4 name the planets in order4 name the planets in order

5 know some details about each planet5 know some details about each planet

6 describe the other parts of the solar 6 describe the other parts of the solar systemsystem

Starter – 5 minutesStarter – 5 minutes How do we know the Earth goes round the Sun How do we know the Earth goes round the Sun

and not the other way round?and not the other way round?

VideoVideo

Solar SystemSolar System

Questions – 5 minutesQuestions – 5 minutes

1.1. DfghlkDfghlk2.2. DfghDfgh3.3. DfghDfgh4.4. DfghDfgh5.5. dfghdfgh

Travel Brochure – 25 minutesTravel Brochure – 25 minutes

Pretend you are a future travel agent Pretend you are a future travel agent selling holidays in spaceselling holidays in space

Make a brochure for a trip to your choice Make a brochure for a trip to your choice of planetof planet

Remember to tell us how long the journey Remember to tell us how long the journey is, what the ‘weather’ is like, and any is, what the ‘weather’ is like, and any sights of special interest on your planetsights of special interest on your planet

HomeworkHomework

Complete the Trends in the Solar System Complete the Trends in the Solar System worksheetworksheet

Extra:Extra:What are comets?What are comets?Why have we sent space probes to collect Why have we sent space probes to collect

dust from inside comets?dust from inside comets?

Are You On Target Today?Are You On Target Today?

Aims:-Aims:- 4 name the planets in order4 name the planets in order

5 know some details about each 5 know some details about each planetplanet

6 describe the other parts of the 6 describe the other parts of the solar systemsolar system

C/WC/W GravityGravity18 Apr 202318 Apr 2023

Aims:-Aims:- 4 know gravity acts to the Earth’s centre4 know gravity acts to the Earth’s centre

5 know gravity keeps things in orbit5 know gravity keeps things in orbit

6 describe how gravity changes in space6 describe how gravity changes in space

Starter – discuss with neighbourStarter – discuss with neighbour

Is there any gravity in space?Is there any gravity in space?

How do you know?How do you know?

What about on the Moon?What about on the Moon?

Copy notes – 5 minutesCopy notes – 5 minutes

Gravity is a forceGravity is a force Everything is pulled towards the centre of Everything is pulled towards the centre of

the Earth by gravitythe Earth by gravity Draw and label diagram p14 (top-right)Draw and label diagram p14 (top-right) Gravity pulls every object towards every Gravity pulls every object towards every

other objectother object Usually the force is tiny …Usually the force is tiny … … … but the Earth is huge so its gravity is but the Earth is huge so its gravity is

strongstrong

Calculating WeightCalculating Weight

Weight is the force the Earth pulls on youWeight is the force the Earth pulls on you Every 1kg is pulled by a force of 10NEvery 1kg is pulled by a force of 10N Work out the weight of:Work out the weight of:

a)a) A 1kg bag of sugarA 1kg bag of sugar

b)b) A 20kg dogA 20kg dog

c)c) A 75kg teacherA 75kg teacher

d)d) A 100g appleA 100g apple Now do purple box p15Now do purple box p15

Extension 1Extension 1

Each planet has different gravityEach planet has different gravity The Moon’s gravity is only 1.6N/kgThe Moon’s gravity is only 1.6N/kg

1.1. Calculate the weight of a 50kg student on:Calculate the weight of a 50kg student on: the moonthe moon Mars (see p16)Mars (see p16) JupiterJupiter PlutoPluto

2.2. Is there any gravity on the Moon?Is there any gravity on the Moon?

3.3. Is there any atmosphere on the Moon? Why?Is there any atmosphere on the Moon? Why?

DemoDemo

OrbitsOrbits

Extension 2Extension 2

1.1. What keeps the bung in the demo going What keeps the bung in the demo going in a circle?in a circle?

2.2. Why does the bung in the demo not Why does the bung in the demo not move towards the hand?move towards the hand?

3.3. What keeps the Earth orbiting the Sun?What keeps the Earth orbiting the Sun?

4.4. What keep the Moon orbiting the Earth?What keep the Moon orbiting the Earth?

5.5. Why do they not pull towards each Why do they not pull towards each other?other?

Why are astronauts weightless?Why are astronauts weightless?

QQ Why does the scale register on Earth?Why does the scale register on Earth?

AA The pull of the Earth on you squashes The pull of the Earth on you squashes the springs insidethe springs inside

QQ Why does a scale not register in orbit?Why does a scale not register in orbit?

AA The pull of the Earth on you keeps you The pull of the Earth on you keeps you going in a circle. None is left over to going in a circle. None is left over to squash the scale’s springs.squash the scale’s springs.

HomeworkHomework

Bring in some junk for model-making next Bring in some junk for model-making next time (cardboard boxes, egg boxes, thin time (cardboard boxes, egg boxes, thin wire, string, tin-foil, coloured paper …)wire, string, tin-foil, coloured paper …)

Extra:Extra: Imagine you are on a trip straight from Imagine you are on a trip straight from

Earth to the Moon. How does the force of Earth to the Moon. How does the force of gravity on you change? Remember both gravity on you change? Remember both the Earth’s and the Moon’s gravity act on the Earth’s and the Moon’s gravity act on you, and that they are different strengths.you, and that they are different strengths.

Are You On Target Today?Are You On Target Today?

Aims:-Aims:- 4 know gravity acts to the Earth’s 4 know gravity acts to the Earth’s centrecentre

5 know gravity keeps things in 5 know gravity keeps things in orbitorbit

6 describe how gravity changes in 6 describe how gravity changes in spacespace

C/WC/W SatellitesSatellites18 Apr 202318 Apr 2023

Aims:-Aims:- 4 know the uses of satellites4 know the uses of satellites5 describe satellite orbits5 describe satellite orbits

6 explain how GPS works6 explain how GPS works

Starter – 5 minutesStarter – 5 minutesWhich planets are these?Which planets are these?

RamsRams US rantUS rant Curry meCurry me

Copy notes – 5 minutesCopy notes – 5 minutes

A satellite is anything that orbits A satellite is anything that orbits something elsesomething else

The Moon is a satellite (of Earth) – it is a The Moon is a satellite (of Earth) – it is a natural natural satellitesatellite

ArtificialArtificial satellites are used to do many satellites are used to do many different jobs such as weather different jobs such as weather forecasting, communication, and spyingforecasting, communication, and spying

Geostationary DemoGeostationary Demo

Run geosync.swfRun geosync.swf

Copy notes – 2 minsCopy notes – 2 mins

Geostationary orbits are used for TV, GPS Geostationary orbits are used for TV, GPS signals and some weather satellitessignals and some weather satellites

Polar orbits are used for spying, mapping Polar orbits are used for spying, mapping and weatherand weather

GPS systems time the signals from GPS systems time the signals from several satellites to work out your exact several satellites to work out your exact positionposition

DescribeDescribe Choose a satellite job (e.g. weather, spying, Choose a satellite job (e.g. weather, spying,

TV …) – give it a nameTV …) – give it a name Describe what it needs to do its job (e.g. Describe what it needs to do its job (e.g.

power, aerial for communication, camera, power, aerial for communication, camera, other sensors, special orbit …)other sensors, special orbit …)

Sky TV Satellite - ASTRASky TV Satellite - ASTRA Aerial to receive TV signalAerial to receive TV signal Aerial to broadcast the signalAerial to broadcast the signal Solar cells to power the satelliteSolar cells to power the satellite Geostationary orbitGeostationary orbit

BuildBuild

Build your satellite from junk!Build your satellite from junk!

HomeworkHomework

Revise for testRevise for test

Are You On Target Today?Are You On Target Today?

Aims:-Aims:- 4 know the uses of satellites4 know the uses of satellites

5 describe satellite orbits5 describe satellite orbits

6 explain how GPS works6 explain how GPS works