Physics - Gravity and Satellites

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What is gravity?
Gravity is a force that exists everywhere. It pulls all things with mass or energy toward one another.

We commonly experience gravity by being pulled downwards by the Earth.

Gravity keeps all of the planets (including Earth) in orbit around the Sun. It
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How does gravity affect weight of objects?
Gravity gives you weight but NOT mass.

Weight is caused by the pull of gravity?

Mass is the amount of something. It never changes
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How is mass, weight and gravity measured?
Mass = kg
Weight= Newtons
Gravity = N/kg
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How to calculate weight?
weight = mass x gravitational field

w=m x g
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How is gravity different on different planets?
The more massive the object, the stronger the force of gravity.
So planets with a large mass (Jupiter) have high gravity). You will weigh more on Jupiter than Earth.
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What are man-made satellites?
A man-made satellite is put into an orbit around the Earth. Artificial satellite use = weather, military, telecommunication, navigation, scientific.

Geostationary satellites remains above the same point on the Earth's surface because they complete one
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Satellites in different orbits have different uses?
Polar= Weather/Observe Earth's surface/military (spying) Because they pass over the more of the Earth and in a low orbit near Earth so better view of Earth.
Geostationary = Communications/GPS because they stay in one position, travel in a high orbit.
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What is a natural satellites?
Any astronomical body that orbits a planet. For example the Earth and the moon.
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Other cards in this set

Card 2

Front

How does gravity affect weight of objects?

Back

Gravity gives you weight but NOT mass.

Weight is caused by the pull of gravity?

Mass is the amount of something. It never changes

Card 3

Front

How is mass, weight and gravity measured?

Back

Preview of the front of card 3

Card 4

Front

How to calculate weight?

Back

Preview of the front of card 4

Card 5

Front

How is gravity different on different planets?

Back

Preview of the front of card 5
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