Astro 7N Unit 1 Comprehensive Questions (Frequently
Most Tested) with Verified Answers
Newton's first law - ANSWERAn 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.
(example: 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 - ANSWERThe 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.
•Force = mass x acceleration (or, F = m a )
•alternatively: a = F / m
•(A smaller mass will move faster, if the same force is applied to it.)
Newton's third law - ANSWERFor 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, g, on the surface of a planet is given by - ANSWERg=
m/r^2 (M is the mass of the planet and R is its radius.)
, 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 -
ANSWERtwice as strong
If the radius of a planet were twice that of another, the gravity is -
ANSWER1/4 as strong
Mars has _____ the mass of the Earth and _____the radius of Earth. -
ANSWER1/10, 1/2
Mars has a surface gravity ____ that of Earth. - ANSWER4/10
Newton's Universal Law of Gravitation - ANSWERhe 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
If the objects were moved 2 times closer... - ANSWERthe gravitational
attraction would become 4 times as great.
What causes day and night? - ANSWERRotation of the Earth on its axis.
How does the Sun appear to move in the sky in the course of a day? -
ANSWEREast to West, because of Earth's rotation. The stars and planets
move in the same way from our point of view, also, because of Earth's
rotation.
What happens to the Earth in one year? - ANSWERIt orbits the Sun, once
(also referred to as one complete revolution about the Sun).
Most Tested) with Verified Answers
Newton's first law - ANSWERAn 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.
(example: 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 - ANSWERThe 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.
•Force = mass x acceleration (or, F = m a )
•alternatively: a = F / m
•(A smaller mass will move faster, if the same force is applied to it.)
Newton's third law - ANSWERFor 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, g, on the surface of a planet is given by - ANSWERg=
m/r^2 (M is the mass of the planet and R is its radius.)
, 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 -
ANSWERtwice as strong
If the radius of a planet were twice that of another, the gravity is -
ANSWER1/4 as strong
Mars has _____ the mass of the Earth and _____the radius of Earth. -
ANSWER1/10, 1/2
Mars has a surface gravity ____ that of Earth. - ANSWER4/10
Newton's Universal Law of Gravitation - ANSWERhe 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
If the objects were moved 2 times closer... - ANSWERthe gravitational
attraction would become 4 times as great.
What causes day and night? - ANSWERRotation of the Earth on its axis.
How does the Sun appear to move in the sky in the course of a day? -
ANSWEREast to West, because of Earth's rotation. The stars and planets
move in the same way from our point of view, also, because of Earth's
rotation.
What happens to the Earth in one year? - ANSWERIt orbits the Sun, once
(also referred to as one complete revolution about the Sun).
