1/7/26, 9:44 AM Astro 7N Exam 1 Most Recent exam COMPLETE (2026) EXAM Questions and Answers (Verified Answers) (Latest Update 2026) UP…
Astro 7N Exam 1 Most Recent exam COMPLETE
(2026) EXAM Questions and Answers (Verified
Answers) (Latest Update 2026) UPDATE!!
Save
Terms in this set (98)
The force of gravity by the Sun keeps They exert an equally strong pull on the sun,
the planet in orbit around it, but how causing it move slightly
do the planets affect the sun?
Newton's First Law An object at rest stays at rest and an object in
motion stays in motion with the same speed and in
the same direction unless acted upon by an
unbalanced force.
ex: if the sun suddenly disappeared, the Earth
would continue in the direction that it was traveling
in its orbit at that time
Newton's Second Law The acceleration of a body due to a force will be in
the same direction as the force, with magnitude
directly proportional to its mass
Force = mass x acceleration
A smaller mas will move faster, if the same force is
applied to it
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Newton's Third Law For every action there is an equal and opposite
reaction
The Sun exerts force on planets, and they orbit it -
he planets exert equal force on Sun, but it only
moves slightly because of its very large mass
relative to the planets
Surface Gravity on a Planet the strength of gravity: g = m/r^2
where M is the mass of the planet and R is its
radius. Note the radius is squared but the mass is
not.
More mass = more gravity.
- If the mass of a planet were twice that of another,
but they had the same radius, the gravity felt on the
surface of the more-massive one would be twice
as strong.
Larger separation = less gravity.
- If the radius of a planet were twice that of
another, the gravity is 1 / (2) 2 = 1/4 as strong.
Putting the effects of mass and radius together, you
should be able to figure out the surface gravity of
Mars, relative to the Earth.
- Mars has 1/10 the mass of the Earth and 1/2 the
radius of Earth. So for Mars,
g = (1/10) / (1/2) 2 = (1/10) / (1/4) = 4/10
Mars has a surface gravity 4/10 that of Earth. You
will need to be able to do this type of estimate for
the test, given the numbers for mass and radius.
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If I apply exactly the same amount of the pebble will move faster
force to a pebble and a boulder,
what will happen
If the Earth were moved to half its it would become 4 times weaker
current distance from the sun, how
would the force of gravity by the sun
on the earth change?
Mass As the mass of the planet increases, the jump
height does decreases by the same factor
As the mass of the planet decreases, the jump
height does increases by the same factor
According to Newton's Second law acceleration increases
of motion, if the net force acting on
the object increases while the mass
of the object remains constant, what
happens to acceleration
If the earth were moves to half its it would become four times weaker
current distance from the Sun, how
would the force of gravity by the Sun
on the Earth change
What did newton's law of universal the force of gravity from the sun will be stronger
gravitation tell us about how gravity on object with more mass
works
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, 1/7/26, 9:44 AM Astro 7N Exam 1 Most Recent exam COMPLETE (2026) EXAM Questions and Answers (Verified Answers) (Latest Update 2026) UP…
If you were to sit on the ground, you are pushing the earth away from yourself with
there would be a force due to the same force
gravity pulling you toward the earth.
which of the following is true
according to newton's third law
what would happen to the earth it would continue to move in the line in the same
sun's gravity somehow turned off direction it was moving when the gravity turned off
instantaneously
Newton's Universal Law of This law gives the force of gravity between any two
Gravitation objects in the Universe. The force of gravity is
proportional to (mass of object 1) × (mass of object
2) divided by the distance between the two objects
squared:
F M1 x M2 / d 2
Again, more mass = stronger gravity. If the objects
were moved 2 times closer (or, to half of their initial
distance between), ...
F M1 x M2 / (1/2) 2 = M1 x M2 / (1/4) = 4 (M1 x M2)
... so, the gravitational attraction would become 4
times as great.
https://quizlet.com/1127898772/astro-7n-exam-1-most-recent-exam-complete-2026-exam-questions-and-answers-verified-answers-latest-update-202… 4/43
Astro 7N Exam 1 Most Recent exam COMPLETE
(2026) EXAM Questions and Answers (Verified
Answers) (Latest Update 2026) UPDATE!!
Save
Terms in this set (98)
The force of gravity by the Sun keeps They exert an equally strong pull on the sun,
the planet in orbit around it, but how causing it move slightly
do the planets affect the sun?
Newton's First Law An object at rest stays at rest and an object in
motion stays in motion with the same speed and in
the same direction unless acted upon by an
unbalanced force.
ex: if the sun suddenly disappeared, the Earth
would continue in the direction that it was traveling
in its orbit at that time
Newton's Second Law The acceleration of a body due to a force will be in
the same direction as the force, with magnitude
directly proportional to its mass
Force = mass x acceleration
A smaller mas will move faster, if the same force is
applied to it
https://quizlet.com/1127898772/astro-7n-exam-1-most-recent-exam-complete-2026-exam-questions-and-answers-verified-answers-latest-update-202… 1/43
,1/7/26, 9:44 AM Astro 7N Exam 1 Most Recent exam COMPLETE (2026) EXAM Questions and Answers (Verified Answers) (Latest Update 2026) UP…
Newton's Third Law For every action there is an equal and opposite
reaction
The Sun exerts force on planets, and they orbit it -
he planets exert equal force on Sun, but it only
moves slightly because of its very large mass
relative to the planets
Surface Gravity on a Planet the strength of gravity: g = m/r^2
where M is the mass of the planet and R is its
radius. Note the radius is squared but the mass is
not.
More mass = more gravity.
- If the mass of a planet were twice that of another,
but they had the same radius, the gravity felt on the
surface of the more-massive one would be twice
as strong.
Larger separation = less gravity.
- If the radius of a planet were twice that of
another, the gravity is 1 / (2) 2 = 1/4 as strong.
Putting the effects of mass and radius together, you
should be able to figure out the surface gravity of
Mars, relative to the Earth.
- Mars has 1/10 the mass of the Earth and 1/2 the
radius of Earth. So for Mars,
g = (1/10) / (1/2) 2 = (1/10) / (1/4) = 4/10
Mars has a surface gravity 4/10 that of Earth. You
will need to be able to do this type of estimate for
the test, given the numbers for mass and radius.
https://quizlet.com/1127898772/astro-7n-exam-1-most-recent-exam-complete-2026-exam-questions-and-answers-verified-answers-latest-update-202… 2/43
,1/7/26, 9:44 AM Astro 7N Exam 1 Most Recent exam COMPLETE (2026) EXAM Questions and Answers (Verified Answers) (Latest Update 2026) UP…
If I apply exactly the same amount of the pebble will move faster
force to a pebble and a boulder,
what will happen
If the Earth were moved to half its it would become 4 times weaker
current distance from the sun, how
would the force of gravity by the sun
on the earth change?
Mass As the mass of the planet increases, the jump
height does decreases by the same factor
As the mass of the planet decreases, the jump
height does increases by the same factor
According to Newton's Second law acceleration increases
of motion, if the net force acting on
the object increases while the mass
of the object remains constant, what
happens to acceleration
If the earth were moves to half its it would become four times weaker
current distance from the Sun, how
would the force of gravity by the Sun
on the Earth change
What did newton's law of universal the force of gravity from the sun will be stronger
gravitation tell us about how gravity on object with more mass
works
https://quizlet.com/1127898772/astro-7n-exam-1-most-recent-exam-complete-2026-exam-questions-and-answers-verified-answers-latest-update-202… 3/43
, 1/7/26, 9:44 AM Astro 7N Exam 1 Most Recent exam COMPLETE (2026) EXAM Questions and Answers (Verified Answers) (Latest Update 2026) UP…
If you were to sit on the ground, you are pushing the earth away from yourself with
there would be a force due to the same force
gravity pulling you toward the earth.
which of the following is true
according to newton's third law
what would happen to the earth it would continue to move in the line in the same
sun's gravity somehow turned off direction it was moving when the gravity turned off
instantaneously
Newton's Universal Law of This law gives the force of gravity between any two
Gravitation objects in the Universe. The force of gravity is
proportional to (mass of object 1) × (mass of object
2) divided by the distance between the two objects
squared:
F M1 x M2 / d 2
Again, more mass = stronger gravity. If the objects
were moved 2 times closer (or, to half of their initial
distance between), ...
F M1 x M2 / (1/2) 2 = M1 x M2 / (1/4) = 4 (M1 x M2)
... so, the gravitational attraction would become 4
times as great.
https://quizlet.com/1127898772/astro-7n-exam-1-most-recent-exam-complete-2026-exam-questions-and-answers-verified-answers-latest-update-202… 4/43
