Astronomy Unit

What affects the force of gravity between two objects?

• The tendency of an object to be attracted to another object
• The tendency of an object to resist a change in motion
• The tendency for an object to revolve in a circle
• The tendency of an object to revolve in an oval shape

Which of these best describes the concept of inertia?

• A force that attracts objects with mass
• the tendency of an object to float in water
• a force created when surfaces are in contact
• The tendency of an object to resist a change in motion

What changes when the pull of gravity changes?

• Mass
• weight
• Volume
• nothing changes

What affects the force of gravity between two objects?

• Their mass and the distance between them
• The distance between them
• The sum of their masses
• The mass of the large object

Which choice shows the objects in order from LARGEST to smallest

• solar system, galaxy, sun, universe, planet
• planet, galaxy, universe, solar system, sun
• universe, galaxy, solar system, sun, planet
• galaxy, universe, solar system, sun, planet

Edwin Hubble discovered the the universe is expanding. Which scientific theory does this fact support?

• Geocentric Model
• Gravitational Pull
• Heliocentric Model
• The Big Bang

How long does the Earth take to orbit or revolve once around the sun?

• day
• month
• week
• year

Which of these would be shorter if the Earth rotated faster?

• day
• month
• week
• year

What is the effect of the gravitational attraction between the sun and the Earth on Earth's orbit?

• It makes the orbit follow a straight path
• It makes the orbit follow a curved path
• It has no effect on the Earth's orbit
• It destroys the orbit

To what degree is the Earth's axis tilted?

• 90
• 45.5
• 23.5
• 0