In Gr. 4 learners covered the fundamental facts around the Moon: its lack of air and also water, size family member to the Planet and also its position with respect to the Sun. They additionally observed the Moon"s phases. In Gr. 6 learners learnt around the Moon"s movement in space: it revolves roughly the Earth whilst rotating on its spin axis. In this chapter, learners will certainly build an expertise of just how the phases of the Moon are regarded the loved one positions of the Planet, Moon and Sun. They will certainly additionally be presented to the principle of gravity, (covered in more detail in Gr. 9: Energy and Change strand), and also the influence of the Moon"s and also Sun"s gravitational pulls on the Earth"s seas which lead to tides.

You are watching: The earth and the moon are kept in orbit by gravity and mass.

The main intends of this chapter are to ensure that learners understand also the following:

The Moon is smaller sized than the Earth and orbits roughly the Earth in 27.3 days as the Earth revolves approximately the Sun. The Moon is hosted in orlittle roughly the Earth by the pressure of gravity. In revolve the Planet and also all the various other planets in the solar device are hosted in orbit about the Sun by the pressure of gravity. All masses experience the pressure of gravity, and also the size of the force exerted is dependent upon the mass of the objects and also their distance from each other. The merged gravitational pull of the Moon and the Sun on the Earth"s oceans reason the sea tides.

2.1 Relative positions (1.5 hours)

Tasks

Skills

Recommendation

Activity: Moon revision quiz

Recalling, stating

Optional revision

Activity: Observe the Moon

Observing

Suggested

Activity: Total Solar Eclipse

Observing, analysing

Suggested

Note: Tright here are 3 extra tasks contained just in the Teacher"s Guide in this section. They are:

Activity: Google the Moon(Replacement activity for "Observe the Moon" if computers and internet are easily accessible.) Activity: Hands-on Moon Phases (Optional expansion activity, revision of Gr. 6 material.) Activity: Month Long Moon Observation (Optional extension activity. This is a repeat of an activity done in Gr. 6. This reminds learners of the Moon"s phases however does not yet attach them to the relative positions of the Sun/Earth/Moon.)

2.2 Gravity (2 hours)

Tasks

Skills

Recommendation

Activity: Demonstrating the Moon"s orlittle approximately the Earth

Investigating, observing

CAPS suggested

Activity: How hefty would you be on other planets?

Calculating, measuring

Suggested

Note: Tbelow is an additional examination consisted of just in the Teacher"s Guide in this section. It is:

Investigation: Dropping objects (Optional extension activity)

2.3 Tides (2.5 hours)

Tasks

Skills

Recommendation

Activity: Reading a tide chart

Reading graphs

Suggested

Activity: Dance of the tides

Working in groups, investigating, analysing

Suggested

Activity: Spring and also neap tides

Observing, analysing

CAPS suggested

Activity: The impact of tides on coastline ecosystems

Researching, analysing, writing

CAPS suggested

Activity: How excellent a fisherguy are you?

Analysing data

Suggested

Note: Tbelow are two additional activities consisted of just in the Teacher"s Guide in this section. They are:

Activity: Tides poster (Optional, fun activity) Activity: Make a tide wheel (Optional activity)


How lengthy does it take for the Moon to orbit the Earth? What keeps the Moon in orbit around the Earth? What reasons tides on Earth?
Earth"s only natural satellite is sindicate referred to as the Moon bereason civilization didn"t understand various other moons existed until Galileo Galilei found four moons orbiting Jupiter in 1610. Other moons in our solar device are given names so they will not be perplexed via each other.


The Moon is the a lot of noticeable function in our night sky and has actually captivated people for countless years. Ancient societies tape-recorded the obvious motion of the Moon through the sky and made calendars which supplied the phases of the Moon to note the months. In reality some religious calendars still usage a lunar (Moon) based calendar fairly than the main solar (Sun) based calendar used today in South Africa and also most of the Western world (referred to as the Gregorian calendar). The Moon"s affect on the Earth is also crucial to us in other ways as you will certainly find in this chapter.

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A spacecraft, dubbed Ladee, was launched in 2013 to orbit the Moon to gather indevelopment about the lunar environment. Have a look at this infographic detailing the mission. http://www.nasa.gov/mission_pages/ladee/infographic/#.Ui4uOCLtnb6


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Our Moon.

Fill in the gaps in the Earth-Moon comparikid table listed below utilizing the word financial institution.

Word bank:

rock, soil and water rock and also lunar soil mirrors absorbs Sun Earth an no larger smaller 24 27.3

The Earth