Universal gravitation
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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.

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Universal Gravitation

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Universal gravitation

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 gravitation1

Universal Gravitation

  • If the radius of Earth decreased, with no change in mass, your weight would:

    • increase

    • not change

    • decrease


Universal gravitation2

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 gravitation3

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 gravitation4

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 gravitation5

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 gravitation6

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 gravitation7

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 gravitation8

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 gravitation9

Universal Gravitation

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

    • true

    • false


Gravitational interactions

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 interactions1

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 interactions2

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 interactions3

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 interactions4

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 interactions5

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 interactions6

Gravitational Interactions

  • When a star collapses to form a black hole, its mass:

    • undergoes an enormous increase

    • decreases

    • remains the same


Gravitational interactions7

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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