Gravity and Mass
True or False: If you went to the moon, you would weigh less because you have less mass.
False: You mass never changes no matter where you are.
Is responsible for Earth's day and night cycle
rotation
Newton's First Law of Motion states:
An object in ________________ tends to stay in _________________ unless acted on by an outside force.
An object in MOTION tends to stay in MOTION unless acted on by an outside force.
OR
An object at REST tends to stay at REST unless acted on by an outside force.
to make an educated guess you can check
hypothesize
the spinning of a planet on its axis
rotation
Which object exerts more gravitational pull?
A 4.5 kg balloon OR a 3.9 kg brick?
A 4.5 kg balloon
is responsible for Earth's seasons and year
revolution
Remember, inertia is an object's resistance to change its motion. Knowing this, which object would have more inertia and why?
A train or a semi-truck?
A train has more inertia. It has a LOT more mass, and therefore a lot more force is required to change its motion.
the movement of an object around another object
revolution
an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
axis
What are the two factors that determine the strength of gravity between two objects?
1. the mass of each object
2. the distance between them
The exact axial tilt of Earth is _______________ degrees.
23.5 degrees
DAILY DOUBLE:
Provide an example of inertia in everyday life.
Answers vary
either of two times of the year when the sun is at its greatest distance from the equator
solstice
the path an object follows as it moves around another object
orbit
True or False? Objects that are bigger have more gravity.
False: Objects that have more MASS have more gravity. A large balloon that only weighs 2kg does not have more gravity than a small rock that weighs 5kg.
If you wanted to move somewhere where the temperatures were consistently warm, where on Earth would you go?
Near the equator (a lot of direct sunlight)
If the planets didn't have their own inertia, what would happen to them?
Their forward momentum would not be able to resist the gravitational pull of the sun and they would fall into it eventually.
each of the two times of the year when days and nights are of equal length
equinox
a force that pulls objects towards each other due to their masses
gravity
Jupiter has more mass, and therefore it has a stronger gravitational pull.
What two forces are being exhibited on the Earth that cause it to revolve around the sun and not fall into it or fly away from it?
The sun's gravity and the Earth's inertia.
Earth rotates from west to east at roughly 1000mph. If it were to stop suddenly, what would happen to you and why?
You would be propelled eastward at a high speed due to your inertia. You don't stop just because the Earth stops.
every object in the universe attracts every other object
Law of Universal Gravitation
the tendency of an object to resist a change in motion
inertia