ASTRO 7N COMPREHENSIVE
EXAMINATION TEST COMPLETE
QUESTIONS WITH ACCURATE SOLUTIONS
●● Newton's Second Law
Answer: The acceleration of a body due to a force will be in the same
direction as the force, with a magnitude inversely proportional to its
mass.
(Usually written F=ma, Force= mass x acceleration)
●● Newton's Third Law
Answer: For every action, there is an equal and opposite reaction
●● Newton's Law of Universal Gravitation
Answer: This law gives the force of gravity between any two 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:
●● Strength of force equation
Answer: Fg = G (m1 m2)/r2
●● More mass=more gravity
,Answer: 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
●● Large separation=less gravity
Answer: If the radius of a planet were twice that of another, the gravity
is 1/(2)2= 1/4 as strong
●● Gravitational Force
Answer: Directly proportional to the mass of each interacting object and
inversely proportional to the distance between them squared
●● Summer = December
Winter = June
Answer: Seasons in the southern hemisphere
●● Dark all day/ Night at south pole
Answer: June
●● the Earth would continue in the direction that it was traveling in its
orbit at that time
Answer: If the sun suddenly disappeared
, ●● the planets exert equal force on Sun, but it only moves slightly
because of its very large mass relative to the planets
Answer: The Sun exerts force on planets, and they orbit it
●● If the mass of a planet were twice that of another, but they had the
same radius,
Answer: the gravity felt on the surface of the more-massive one would
be twice as strong.
●● Rotation of the earth on its axis
Answer: What causes day and night
●● East to West because of Earth's rotation. The stars and planets move
in the same way from our point of view, also because of earths rotation
Answer: How does the sun appear to move in the sky in the course of the
day?
●● It orbits the sun, once
Answer: What happens to the earth in one year
●● The tilt of the Earth's axis of rotation, with respect to the plane of its
orbit around the Sun (and not because of changing distance from Sun).
The Earth's tilt is about 23 degrees.
Answer: Why do we have seasons?
EXAMINATION TEST COMPLETE
QUESTIONS WITH ACCURATE SOLUTIONS
●● Newton's Second Law
Answer: The acceleration of a body due to a force will be in the same
direction as the force, with a magnitude inversely proportional to its
mass.
(Usually written F=ma, Force= mass x acceleration)
●● Newton's Third Law
Answer: For every action, there is an equal and opposite reaction
●● Newton's Law of Universal Gravitation
Answer: This law gives the force of gravity between any two 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:
●● Strength of force equation
Answer: Fg = G (m1 m2)/r2
●● More mass=more gravity
,Answer: 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
●● Large separation=less gravity
Answer: If the radius of a planet were twice that of another, the gravity
is 1/(2)2= 1/4 as strong
●● Gravitational Force
Answer: Directly proportional to the mass of each interacting object and
inversely proportional to the distance between them squared
●● Summer = December
Winter = June
Answer: Seasons in the southern hemisphere
●● Dark all day/ Night at south pole
Answer: June
●● the Earth would continue in the direction that it was traveling in its
orbit at that time
Answer: If the sun suddenly disappeared
, ●● the planets exert equal force on Sun, but it only moves slightly
because of its very large mass relative to the planets
Answer: The Sun exerts force on planets, and they orbit it
●● If the mass of a planet were twice that of another, but they had the
same radius,
Answer: the gravity felt on the surface of the more-massive one would
be twice as strong.
●● Rotation of the earth on its axis
Answer: What causes day and night
●● East to West because of Earth's rotation. The stars and planets move
in the same way from our point of view, also because of earths rotation
Answer: How does the sun appear to move in the sky in the course of the
day?
●● It orbits the sun, once
Answer: What happens to the earth in one year
●● The tilt of the Earth's axis of rotation, with respect to the plane of its
orbit around the Sun (and not because of changing distance from Sun).
The Earth's tilt is about 23 degrees.
Answer: Why do we have seasons?
