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History of Modern Astronomy
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This is called an inverse-square law.

mA

mB

ForceB on A

ForceA on B

Slide 28

Practice

Practice

The Earth exerts a gravitational force on an orbiting satellite. Use Newtons third law to compare the force of the satellite on the Earth. Draw a picture similar to the ones I drew for object A and object B.

According to Newtons second law, compare the accelerations of the satellite and Earth as a result of their interaction.

Slide 29

Deriving Keplers laws

Deriving Keplers laws

Newtons law of gravitation, and Newtons second law (net force = mass x acceleration) can be used to derive Keplers three laws of planetary motion.

Slide 30

Summary

Summary

Understand the importance of experiment.

when theory does not explain measurements, a new hypothesis must be developed; this may require a whole new model (a way of thinking about something).

know why the geocentric view was abandoned.

know what experiments verified the heliocentric view.

Understand the roles of the characters in the revolution from a geocentric to a heliocentric model.

Understand Keplers three laws of planetary motion

these described the planets motions

Understand Newtons law of gravitation and the three laws of motion

these explain why Keplers three laws are true

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