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Gravity and Inertia
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Which planet was predicted and discovered using Newton's law of gravity?
Neptune
Imagine the Earth suddenly has no gravity. What would happen if you dropped an apple?
The apple would simply float in one place (due to inertia)
What is more attractive? Two elephants, 2 meters apart. Or 4 elephants (two and two) 4 meters apart?
Two elephants, 2 meters apart
If you double the mass of one object, how much would the force of gravity between the two objects change?
The force of gravity would be 2 times more.
If you double the distance between two objects, how much would the force of gravity change?
The force of gravity would decrease by a factor of 4.
If you double the mass of both objects, how much would the force of gravity change?
The force of gravity would be 4 times more.
Imagine the sun suddenly has no gravity. What would happen to the Earth's motion?
The Earth would travel in a straight line out of the solar system (due to inertia)
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.
The law of Inertia says that objects at rest will stay at rest, and objects in motion...
will keep moving at a constant speed.
What is the reason Earth revolves around the Sun instead of falling into it?
Inertia
Explain mass in your own words.
Mass is the amount of matter in an object
Think about the relationship between mass and gravity. More mass = (more / less) gravity?
More mass = More gravity
Name two forces that keep the planets in orbit around the Sun.
Gravity and Inertia
Gravity is the force that (pulls objects towards each other / pushes objects away from each other)?
Pulls objects towards each other
Mercury has less gravity than Jupiter. If you kicked 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 forces called shown by the arrows in this image?
Gravity and Inertia
Fill in the blank: The greater the distance between objects, the (smaller/greater) the force of attraction.
smaller
Which object in our solar system has the greatest gravitational force?
the Sun
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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