Lots of fun! Win valuable prizes! The Gravity Game Lots of fun! Win valuable prizes!

1. Why did Newton think there was a force acting on the moon? Because the moon is moving Because there is no air on the moon Because the moon moves in a curved path Because the moon always keeps one side toward Earth all of the above

If the mass of Earth decreased, with no change in radius, your weight would stay the same. decrease. increase also.

The gravitational force between two massive spheres depends inversely on the square of the distances between them. is always an attraction. depends on how massive they are. all of the above

Two objects move away from each other Two objects move away from each other. As the objects get farther and farther apart, the force between them remains constant. decreases. increases.

Suppose the gravitational force between two asteroids separated by a certain distance is 100 N. The asteroids then move apart so they are separated by twice the original distance. What is the force between them now? 400 N 200 N 100 N 50 N 25 N

Where are high tides on Earth located? On the oceans closest to the sun and farthest from the sun Only on the oceans closest to the moon Only on the oceans closest to the sun On the oceans closest to the moon and farthest from the moon

Some stars expand until their mass becomes so great that only light can escape. Such a star becomes a black hole. True False

If the sun were to collapse to form a black hole, Earth would leave the solar system in the direction of its tangential velocity immediately disappear spiral into the black hole be drawn into the black hole orbit the black hole just as it orbits the sun now

When a star collapses to form a black hole, its mass decreases increases remains the same