The Solar System The Moon The Earth The Sun How do they move? Why doesn’t the Earth fly away? Photos by NASA.

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Presentation transcript:

The Solar System The Moon The Earth The Sun How do they move? Why doesn’t the Earth fly away? Photos by NASA

The Solar System The Moon The Earth The Sun Which is stronger: -the force of gravity between the Earth and the sun? or -the force of gravity between the Earth and the moon?

Equation of Gravity F = force of gravity G = gravitational constant = 6.674x Nm 2 /kg 2 m 1 = mass of the first thing (in kg) m 1 = mass of the second thing (in kg) r = distance between the two things (in m)

The Solar System The Moon The Earth The Sun What is the force of gravity between the sun and the Earth?

Equation of Gravity F = force of gravity G = gravitational constant = 6.674x Nm 2 /kg 2 m 1 = mass of the first thing (in kg) m 1 = mass of the second thing (in kg) r = distance between the two things (in m) Remember: There are 1000 m (or 10 3 m) in 1 km