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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.
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 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 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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