Two satellites are orbiting the Earth. One is 100 km above the surface and the other is 200 km above the surface. Which satellite takes longer to travel around Earth once? Which satellite travels faster? How come?
What is escape velocity?
What is the difference between a revolution and a rotation?
Which planets are included in the Inner Planets (or the Terrestrial Planets)?
Which planets are included in the outer Planets (or the Gas Giants)?
What is the order of the 8 planets from closest to farthest away?
Which planet is the smallest?
Which planet is the largest?
What did Newton notice about the moon?
What is a projectile? Would the moon be an example?
How would gravity change for a planet that increases its mass?
How would gravity change for a planet that keeps its same mass but shrinks? Why?
What does gravity depend on? Which factors are direct and which are indirect?
Which force is greater: the gravitational pull of the Sun on the Earth or the gravitational pull of the Earth on the Sun?
What would happen to the force of gravity between two comets if they moved closer toward one another?
Suppose the gravitational force between two spheres is 400 N. If the distance between the spheres is changed to 5 x closer, what would be the new force of gravity?
Suppose the gravitational force between two spheres is 600 N. If the distance between the spheres is changed to 3 x farther away, what would be the new force of gravity?
Suppose the gravitational force between two spheres is 250 N. If the mass of one planet is cut in half, what would be the new force of gravity between them?
Suppose the gravitational force between two planets is 800 N. If the mass of one planet is doubled (2 times bigger) and the mass of the second planet is quadrupled (4 times bigger) what would be the new gravitational force?
Suppose the gravitational force between two planets is 80 N. If the distance between the planets is changed to 4 x closer, and the mass of one planet is tripled, what would be the new gravitational force?
Which force is greater: the gravitational force from the Sun on the Earth or the gravitational force from the moon on the Earth? How do you know?
How does the gravitational strength of the Earth change as you dig into the Earth itself?
What is strange about the gravity at the center of the Earth?
What would happen if you were able to fall through the entire Earth? When would you start to slow down?
What would happen to the Earth’s orbit around the Sun if the Sun collapsed into a black hole?
What happens to the mass of a star when it collapses into a black hole?
What is a black hole?
A comet orbits around the Sun, and at times it is very close to the Sun, and at other times it is very far away from the Sun.Where would it be traveling the fastest? Where would it have the most GPE?
Why doesn’t the moon crash into the Earth?
How many Astronomical Units (AU) is it from the Earth to the Sun?
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