Gravity
What is the definition of gravity?
The universal attraction between 2 objects.
_______________ is the amount of matter an object contains.
Mass
What are the 4 terrestrial planets?
Mercury, Venus, Earth, and Mars
Comet
What speed do objects fall on Earth at?
9.8 m/s2
What are the 2 factors of gravity?
The force of gravity acting on an object is the object's ______________.
Weight
What are the 4 Jovian planets?
Jupiter, Saturn, Neptune, Uranus
What are pieces of large space rock that are usually located between the orbits of Mars and Jupiter?
asteroids
What opposing force acts against gravity? It also can prevent an object from falling at a rate of 9.8m/s2.
Air resistance
Which object's gravity holds the planets in their orbits?
The sun!
If you were hypothetically able to stand on all objects in space, on which object would you weigh the most?
I would accept "the sun" or "Jupiter."
What is the order of the planets based off of distance from the sun?
Mercury, Venus, Earth, Mar, Jupiter, Saturn, Uranus, Neptune
What is the name of the pieces of space rock that orbit between Mars and Jupiter?
What unit is used to represent distances inside the Solar System?
Astronomical Unit (AU)
If you were standing on the moon, why would you weigh less than you would on the earth?
The moon has less mass; therefore, its gravitational pull is much less than earth's.
What would happen to the gravitational pull of an object if its mass increased?
The gravitational pull of the object would also increase.
What is the order of the planets based off their mass? (go from most massive to least)
Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury
When an asteroid enters Earth's atmosphere sometimes as a streak of light, these are now called what?
meteors
How does mass affect spacetime (think of the fabric example in your notes)?
Increased mass means an increased bend in space/time.
True or False: Weight is determined by how much gravity is pulling you down. That is why your weight changes from planet to planet.
True!
If an object has more mass, will it fall faster than an object with less mass?
No, all objects fall at a rate of 9.8 m/s2
Why don't planets fly into the sun?
The planets are moving so fast. (inertia plus sun's gravity)
Do you remember the size and shapes of asteroids?
They can be as big as one mile wide! They are shaped irregularly.
Why does a brick and a feather drop at the same time on the moon but not if we did that on Earth?
On the moon, there is no air resistance, so the feather and the brick fall at the same rate and hit the surface at the same time. The air resistance on Earth causes the feather to slow down and hit it much later than the brick.