Chapter 9

Astronauts in the international space station appear to float in space. Which of the following best describes the reason.

Astronauts have no apparent weight in orbit because they are falling together with their space station.

If the distance between two asteroids doubled, how would the the gravitational force between those two asteroids be affected?

The force would be a quarter what it was

You're riding a roller coaster that is going around a vertical loop-the-loop. You feel heavier at the bottom of the loop because

You apparent weight is greater than your actual weight.

If you weigh yourself in an elevator, you'll weigh less when the elevator

accelerates downward

Inside a freely-falling runaway elevator, your

apparent weight is zero.

When an object is in a state of weightlessness, that means

it has no support force.

If the masses of two planets are each somehow doubled, the force of gravity between them

quadruples.

If the gravitational force between an object and Earth is 50 N,

the weight of the object is 50 N.