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ASTRO 001 EXAM 1 PSU QUESTIONS WITH CORRECT ANSWERS
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ASTRO 001 EXAM 1 PSU QUESTIONS WITH CORRECTANSWERS
Newton's first law of gravity - CORRECT ANSWER-an object at rest or in motion (in a straight line at a
constant speed) will remain in that state unless acted upon by a force
Which of law of gravity does the following related to?
If the Sun disappeared, the earth would continue in the direction that it was traveling in it's orbit at the
time - CORRECT ANSWER-Newton's first law of gravity
Newton's second law of gravity - CORRECT ANSWER-The acceleration of a body die to a force will be in
the same direction as the whole force with a magnitude directly proportional to it's mass
Which of law of gravity does the following related to?
Force = mass x acceleration - CORRECT ANSWER-Newton's second law of gravity
If you have a large rock and a small rock and apply the same force to it, which one will move faster?
(Newton's second law of gravity) - CORRECT ANSWER-The small rock
Newton's third law of gravity - CORRECT ANSWER-For every action, there is an equal and opposite
reaction
The sun exerts a force on the planets and that is why they orbit around it. The planets exert the same
force on the sun, why does it only move slightly? - CORRECT ANSWER-because of the sun's relatively
large mass
The equation for the strength of the gravity on the surface of a planet (surface gravity) - CORRECT
ANSWER-g = M / R^2
Astro 001 Exam 1 PSU questions with correct answers
, What does it mean if the mass of a planet is twice that of another with the same radius? - CORRECT
ANSWER-The gravity is two times stronger (more mass = more gravity)
Larger separation = less ______________ - CORRECT ANSWER-gravity
If Mars has 1/10th of Earth's mass, and 1/2 of Earth's radius.... what is the surface gravity of Mars
relative to Earth? - CORRECT ANSWER-g = (1/10) / (1/2)^2 = 4/10
Newton's Universal Law of Gravitation definition - CORRECT ANSWER-Gives the force of gravity between
any two objects in the universe
Newton's Universal Law of Gravitation equation - CORRECT ANSWER-(mass of object 1) x (mass of object
2) / (distance between the two objects)^2
Why do seasons happen? - CORRECT ANSWER-b/c the Earth's axis is tilted
Mars has a ___________ rotation axis tilt in comparison to Earth - CORRECT ANSWER-similar
Why does the temperature of Earth not change very much over the course of a year? - CORRECT
ANSWER-b/c the distance between the Earth and Sun does not change very much over the course of a
year
What causes day and night? - CORRECT ANSWER-rotation of the Earth on it's axis
In what direction does the sun appear to move in the sky over the course of a day? - CORRECT ANSWER-
East to West
Why does the sun appear to move East to West over the course of a day? - CORRECT ANSWER-b/c of the
Earth's rotation
In what direction do the stars and planets appear to move in the sky over the course of a day? -
CORRECT ANSWER-East to West
Astro 001 Exam 1 PSU questions with correct answers
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