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Solar system and grvaity

By Ammara Shahzad

What is gravity?

Gravity is a force of attraction between objects that is due to their masses and the distances between them

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​•Gravity accounts for the formation of planets, stars, and galaxies.

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•Gravity also keeps smaller bodies in orbit around larger bodies.

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Poll

Which objects have the higher force of attraction

• Objects with greater masses

• objects with lesser masses

Poll

Which objects have the higher force of attraction

• •Objects that are close together

• objects that far apart

•The 16th century Polish astronomer Nicolaus Copernicus changed our view of the solar system.

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•He discovered that the motions of the planets could best be explained if the planets orbited the sun.

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•Danish astronomer Tycho Brahe used special instruments to accurately measure planetary motions over a period of 20 years.

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•Using Tycho’s data, Johannes Kepler discovered what we call Kepler’s laws of planetary motion.

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•Kepler’s first law states that planetary orbits are ellipses with the sun at one focus.

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•The second law states that planets move faster in their orbits when they are closer to the sun.

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The third law relates the distance of a planet from the sun to the time the planet takes to go once around its orbit​

•When an object follows an elliptical orbit around the sun, there is one point, called aphelion, where the object is farthest from the sun.

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•There is also a point, called perihelion, where the object is closest to the sun.

•According to Kepler 2nd law:

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•planet moves slower at aphelion.

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•a planet moves faster at perihelion.

Multiple Choice

When an object follows an elliptical orbit around the sun, there is one point, called aphelion, where the object is farthest from the sun.

• True

• False

Open Ended

what is perihelion?

What is the law of universal gravitation?

Sir Isaac Newton became the first scientist to mathematically describe how the force of gravity behaves.

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•gravity is the force that accounts for both the fall of an apple from a tree and the movement of the moon around Earth.

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•In 1687, Newton formulated the law of universal gravitation.

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Subject | Subject

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law of universal gravitation

•The law of universal gravitation states that all objects in the universe attract each other through gravitational force.

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Open Ended

Who formulated the law of Universal gravitation?

Open Ended

How was your today's lesson?

Open Ended

What do you understand from today's lesson?