Astro 7n Exam 1 (Unit 1 & 2) Quiz Questions And Accurate Solutions
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Course
Astro 7n
Institution
Astro 7n
According to Newton's Second Law of motion, if the net force acting on the object increases while the mass of the object remains constant, what happens to the acceleration?
Hint: Remember F = m * a - CORRECT ANSWER Acceleration Increases
If the earth were moved to half its current distance ...
Astro 7n Exam 1 (Unit 1 & 2) Quiz Questions And
Accurate Solutions
According to Newton's Second Law of motion, if the net force acting on the object increases while the
mass of the object remains constant, what happens to the acceleration?
Hint: Remember F = m * a - CORRECT ANSWER Acceleration Increases
If the earth were moved to half its current distance from the sun, how would the force of gravity by the
sun on the earth change?
Hint: Recall the form of the equation that you derived, earlier in the game: "gravitational acceleration (g)
is proportional to the mass (m) of the body you are bound to, and INVERSELY proportional to the
SQUARE of your distance (r) from its center mass," or g = m / (r * r) - CORRECT ANSWER It would be four
times stronger
What did newton's law of universal gravitation tell us about how gravity works?
Hint: Recall that the FORCE of gravity ('F = ma' or 'F = mg'), unlike gravitational acceleration (just the 'a'
or 'g'), depends on the masses of two objects interacting -- remember that the 'g' in 'F = mg' is also
dependent on a mass value (of a second object). - CORRECT ANSWER The force of gravity from the sun
will be stronger on an object with more mass
The earth's radius is about 6400 km. If you were to orbit in the space station 150 km above the ground,
the force of gravity you feel from earth would be...?
Hint: think only about Newton's Law of Universal Gravitation. Recall the form of the equation that you
derived earlier in the game: "gravitational acceleration (g) is proportional to the mass (m) of the body
you are bound to, and INVERSELY proportional to the SQUARE of your distance (r) from its center mass,"
or g = m / (r * r) - CORRECT ANSWER Slightly weaker than when you are standing on earth
If you were to sit on the ground ere would be a force due to gravity pulling you toward earth. which of
the following is true according to newton's 3rd law?
, Hint: Remember each force has an equal and opposite reaction. - CORRECT ANSWER You are pushing
the earth away from yourself with the same force
What would happen to the earth if the Sun's gravity somehow turned off instantaneously?
Hint: Recall Newton's First Law of Motion (also referred to as "inertia"): "An object at rest will remain as
rest unless acted upon by a force. An object in motion will continue in motion --- in a straight path and at
constant velocity -- unless acted upon by a force, Think of a moment about the force of gravity between
the Earth and the Sun, and which way or ways that force is directed. - CORRECT ANSWER It would
continue to move in a line in the same direction it was moving when the gravity turned off
Consider a planet whose rotation axis is NOT tilted with respect to its orbital plane. What are the
season's like on this planet?
Hint: The seasons on Earth aren't caused by different distances from the Sun in different parts of the
orbit. What are they caused by? - CORRECT ANSWER There are no seasons
If the Earth rotated on its axis more slowly than it does now...
Hint: How long does it take for the Earth to rotate - CORRECT ANSWER Its days would be longer
If Earth has its orbit changed so that at all points along its orbit it was always the same distance from the
sun (circular orbit), how would this affect the seasons on Earth?
Hint: Remember that the orbit of the sun around the earth is an eclipse but that it is pretty close to being
a circle - CORRECT ANSWER They would be the same as they are now.
A new planet orbits its star faster than the Earth orbits the Sun and it rotates more slowly than the earth
rotates. Therefore....
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