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Gravity and Inertia Review
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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.
What is the reason the Earth revolves around the Sun instead of falling into it?
Inertia
Fill in the blank: The greater the distance between objects, the ____________ the force of attraction.
Smaller
You have two containers that are the same size. One container is full of rocks. One container is full of feathers. Which container has greater mass?
The container of rocks.
Explain what mass is in your own words.
Mass is the amount of matter in an object.
Name two factors that keep planets in orbit around the sun.
Gravity and Inertia
Explain orbital motion in your own words. (Orbital motion is what planets orbiting the sun is called.)
Orbital motion is when an object is moving forward (inertia) and at the same time is pulled by gravity towards an object.
Explain inertia in your own words.
Inertia is a tendency to remain unchanged. Objects in motion keep moving at a constant speed. Objects at rest will stay at rest.
Think about the relationship between mass and gravity. More mass =???
More Gravity
Explain gravity in your own words.
Gravity is the force that pulls objects toward each other.
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
What are the two factors called shown by the arrows in this image?
Gravity and Inertia
Which object in our solar system has the greatest gravitational force?
Sun


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