Astro 7N Unit 1 Exam 1 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Newton's 1st Law - CORRECT ANSWER - An object at rest, or in motion, will remain in
that state unless acted upon by a force.
Example: if the Sun disappeared, the Earth would continue in the direction that it was traveling
in its orbit at that time
Newton's 2nd Law - CORRECT ANSWER - the acceleration of a body due to a force will
be in the same direction as the force, with a magnitude directly proportional to its mass.
-a smaller mass will move faster, if the same force is applied to it.
Newton's 3rd Law - CORRECT ANSWER - For every action, there is an equal and
opposite reaction.
-the Sun exerts force on planets, and they orbit it- the planets exert equal force on Sun, but it
only moves slightly because of its very large mass relative to the planets.
the strength of gravity, on the surface of a planet is given by - CORRECT ANSWER -
g=M/(R)^2
-M=mass
-R=radius
More mass=more gravity - CORRECT ANSWER - if the mass of a planet were twice that
of another, but they had the same radius, the gravity felt on the larger mass surface would be
twice as strong.
Larger separation=less gravity - CORRECT ANSWER - if the radius of a planet were
twice that of another, the gravity is 1/4 as strong
, Newton's Universal Law of Gravitation - CORRECT ANSWER - -the force of gravity
between two objects in the Universe
-the force of gravity is proportional to (Object 1 Mass x Object 2 Mass)/(distance)^2
What causes day and night? - CORRECT ANSWER - Rotation of the Earth on its axis
How does the sun appear to move in the sky in the course of a day? - CORRECT
ANSWER - -East to West because of Earth's rotation
-the stars and planets move int he same way from our point of view
What happens to the Earth in one year? - CORRECT ANSWER - It orbits the sun, once
(one complete revolution)
How do we have seasons? - CORRECT ANSWER - The tilt of the Earth's axis of rotation,
with respect to the plane of its orbit around the sun
-the earth's tilt is about 23 degrees
How is the Earth's axis tilted when we have summer in the Northern Hemisphere? - CORRECT
ANSWER - With the North pole towards the sun
What season is it int he Southern Hemisphere when it is summer in the Northern Hemisphere? -
CORRECT ANSWER - Winter
Winter begins on Dec 21 - CORRECT ANSWER - in the Northern Hemisphere, nights are
longer than days
Spring begins on March 21 - CORRECT ANSWER - days and nights have equal length
Summer begins on June 21 - CORRECT ANSWER - days longer than nights in the
Northern Hemisphere
ACTUAL Exam Questions and CORRECT
Answers
Newton's 1st Law - CORRECT ANSWER - An object at rest, or in motion, will remain in
that state unless acted upon by a force.
Example: if the Sun disappeared, the Earth would continue in the direction that it was traveling
in its orbit at that time
Newton's 2nd Law - CORRECT ANSWER - the acceleration of a body due to a force will
be in the same direction as the force, with a magnitude directly proportional to its mass.
-a smaller mass will move faster, if the same force is applied to it.
Newton's 3rd Law - CORRECT ANSWER - For every action, there is an equal and
opposite reaction.
-the Sun exerts force on planets, and they orbit it- the planets exert equal force on Sun, but it
only moves slightly because of its very large mass relative to the planets.
the strength of gravity, on the surface of a planet is given by - CORRECT ANSWER -
g=M/(R)^2
-M=mass
-R=radius
More mass=more gravity - CORRECT ANSWER - if the mass of a planet were twice that
of another, but they had the same radius, the gravity felt on the larger mass surface would be
twice as strong.
Larger separation=less gravity - CORRECT ANSWER - if the radius of a planet were
twice that of another, the gravity is 1/4 as strong
, Newton's Universal Law of Gravitation - CORRECT ANSWER - -the force of gravity
between two objects in the Universe
-the force of gravity is proportional to (Object 1 Mass x Object 2 Mass)/(distance)^2
What causes day and night? - CORRECT ANSWER - Rotation of the Earth on its axis
How does the sun appear to move in the sky in the course of a day? - CORRECT
ANSWER - -East to West because of Earth's rotation
-the stars and planets move int he same way from our point of view
What happens to the Earth in one year? - CORRECT ANSWER - It orbits the sun, once
(one complete revolution)
How do we have seasons? - CORRECT ANSWER - The tilt of the Earth's axis of rotation,
with respect to the plane of its orbit around the sun
-the earth's tilt is about 23 degrees
How is the Earth's axis tilted when we have summer in the Northern Hemisphere? - CORRECT
ANSWER - With the North pole towards the sun
What season is it int he Southern Hemisphere when it is summer in the Northern Hemisphere? -
CORRECT ANSWER - Winter
Winter begins on Dec 21 - CORRECT ANSWER - in the Northern Hemisphere, nights are
longer than days
Spring begins on March 21 - CORRECT ANSWER - days and nights have equal length
Summer begins on June 21 - CORRECT ANSWER - days longer than nights in the
Northern Hemisphere
