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# Gravity and Inertia

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Gravity and Inertia in our Solar System
• Why is the moon affected by Earth's gravity more than by the Sun's gravitational pull?
Because the moon is much closer to the Earth (than the Sun)
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• Which object in our solar system has the greatest gravitational force?
the Sun
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• Fill in the blank: The greater the distance between objects, the (smaller/greater) the force of attraction.
smaller
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• What are the two forces called shown by the arrows in this image?
Gravity and Inertia
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• Mercury has less gravity than Jupiter. If you threw a ball with the same velocity on both planets, on which planet would the ball go a greater distance? Why?
Mercury because it has less gravity pulling the ball down
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• Gravity is the force that (pulls objects towards each other / pushes objects away from each other)?
Pulls objects towards each other
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• Name two forces that keep the planets in orbit around the Sun.
Gravity and Inertia
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• Think about the relationship between mass and gravity. More mass = (more / less) gravity?
More mass = More gravity
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• Explain mass in your own words.
Mass is the amount of matter in an object
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• What is the reason Earth revolves around the Sun instead of falling into it?
Inertia
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• The law of Inertia says that objects at rest will stay at rest, and objects in motion...
will keep moving at a constant speed.
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• Why would the same person weight more on one planet than on another one?
The larger planet has more gravity and makes your weight increase (even though your mass stays the same.
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• Explain orbital motion in your own words.
When an object is moving forward due to inertia, and at the same time, is pulled by gravity towards another object.
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