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## PowerPoint Slideshow about ' Universal Gravitation' - moira

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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

Universal Gravitation

- If the radius of Earth decreased, with no change in mass, your weight would:
- increase
- not change
- decrease

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

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

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

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

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

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

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

Universal Gravitation

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

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

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

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

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

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

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

Gravitational Interactions

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

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

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