# Universal Gravitation Chapter 9 Test P3

## Quiz by Ian Meek

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10 questions
• Q1

For some massive stars, gravitational collapse doesn’t stop until the density of the star becomes so enormous that even light cannot escape. Such a star becomes a black hole.

true
false
True or False
300s
• Q2

The earth and the sun pull on each other with the same amount of gravitational force.

true
false
True or False
300s
• Q3

Ocean tides are caused by differences in the gravitational pulls by the moon on opposite sides of the earth.

true
false
True or False
300s
• Q4

The gravitational force of Earth on an object increases as the object moves farther from Earth.

false
true
True or False
300s
• Q5

If Earth were its present volume but with more mass, we would weigh more.

true
false
True or False
300s
• Q6

The gravitational force between two massive spheres

is always an attraction.

depends on how massive they are.

depends inversely on the square of the distances between them.

300s
• Q7
Suppose the gravitational force between two massive balls is 20N. If the distance between the balls is cut in half, what is the force between the masses?

5 N

20 N

40 N

80 N

300s
• Q8

The gravitational field strength at the center of Earth is

zero.

great.

smaller than on the surface but still larger than zero.

the same as on the surface.

300s
• Q9

If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh

more.

zero.

the same.

less, but more than zero.

300s
• Q10

By what factor would your weight be multiplied if Earth’s diameter shrank to half and Earth’s mass doubled?

Users enter free text