1. Universal Gravitation
Newton hypothesized that the moon:
is a projectile
is actually attracted to Earth
is falling around Earth
has tangential velocity that prevents it from falling into earth
all of the above

2. Universal Gravitation
If the radius of Earth decreased, with no change in mass, your weight would:
increase
not change
decrease

3. Universal Gravitation
A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force, if either, is greater?
the force on A
the force on B
both forces are the same

4. Universal Gravitation
A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which object will accelerate more?
object A
object B
both objects accelerate the same

5. Universal Gravitation
The force of gravity on you is greatest when you are standing:
above the earth’s surface
at the center of the earth
on the earth’s surface

6. Universal Gravitation
Consider the gravitational force between the earth and a meteor in outer space. If the meteor moves so its distance from the earth’s center doubles, the gravitational force on the meteor will be:
one quarter
half
double
quadruple

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

8. Universal Gravitation
Suppose the gravitational force between two masses is 10 newtons. If the volume of each mass doubles, while everything else stays the same, what is the force between the masses?
40 N
20 N
10 N
5 N
2.5 N

9. Universal Gravitation
The force of attraction between two masses depends inversely on the square of the distance between them. Any law that follows this relationship is called an inverse square law.
true
false

10. Universal Gravitation
Because Earth is “falling” around the sun, it will eventually crash into it.
true
false

11. Gravitational Interactions
The value of the acceleration due to gravity:
depends on the radius of Earth
depends on the mass of Earth
depends on the universal gravitational constant
is different on different planets
all of the above

12. Gravitational Interactions
Gravitational field lines show the:
direction a mass would be accelerated
direction of the field
direction of the force on any mass
strength of the field
all of the above

13. Gravitational Interactions
The acceleration due to gravity at the center of the earth is:
large
the same as on the surface
slightly less than on the surface
zero

14. Gravitational Interactions
If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh:
more
the same
less, but more than zero
zero

15. Gravitational Interactions
The affect of the sun’s pull on the earth’s oceans is much less visible that that of the moon’s pull because:
Earth is orbiting so fast
Earth is rotating so fast
the sun is so far away
the sun is radiating a lot of energy
none of the above

16. Gravitational Interactions
A lunar eclipse occurs when:
the sun is between Earth and the moon
the moon is between Earth and the sun
Earth is between the moon and the sun

17. Gravitational Interactions
When a star collapses to form a black hole, its mass:
undergoes an enormous increase
decreases
remains the same

18. Gravitational Interactions
The factor most directly responsible for making a black hole invisible is:
size
mass
color
not even light can escape
none of the above