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WorksheetsGravitation
Total questions: 27
Worksheet time: 14mins
The gravitational attraction between an object near the Earth's surface and the Earth.
normal force
weight
friction
tension
Formula for getting the weight, or gravitational force, of objects near the Earth's surface.
w = m/g
w =mg2
w = mg/2
w = mg
As the Earth pulls on the ball with force magnitude mg,
The ball also pulls on the Earth with force magnitude mg
The ball also pulls on the Earth with a much lesser force magnitude
The ball doesn't pull on the Earth at all.
The ball pulls with a much greater force on the Earth
Who discovered the Law of Gravitation?
Thomas Edison
Albert Einstein
Isaac Newton
Galileo Galilei
Which of the following statements is most true about Newton's law of gravitation?
It is a force that objects with big mass apply on objects with much smaller masses.
It is a force that exists between any two bodies with mass
It is a force that exists between planets, stars and other heavenly bodies.
It is a force that pushes objects around a circle in orbit.
The gravitational force
can be attractive or repulsive
is tangential to the orbital path
is always repulsive
Is always attractive
The gravitational force between the Sun and the Earth
points away from each other
points toward each other
for the sun, pointing upwards; for the earth, pointing downwards
only the sun exerts a gravitational force on the Earth
Comparing the value of the gravitational force that the Earth and sun exerts on each other,
F on earth > F on sun
F on sun > F on earth
F on sun = F on earth
F on sun is nonzero, F on earth = 0
Here the mass of the Sun is doubled, while the mass of the Earth is kept the same.
Fg (gravitational force between Earth and mass) is halved
Fg is doubled
Fg is quadrupled
Fg stays the same
Here the mass of the EARTH is doubled, while the mass of the Sun stays the same. Fg...
is doubled for the Earth but stays the same for the Sun
is halved
is doubled
stays the same
Here both the mass of the Earth and the sun are doubled.
Fg is doubled
Fg is tripled
Fg is quadrupled
Fg is reduced by a quarter
If the mass of the Sun is doubled, while that of the Earth is halved, then the Fg between them
is halved
is doubled
is 1.5 times greater than the original
stays the same
As the Earth moves around the Sun, the gravitational force (Fg) acting on the Earth
is pointing towards the Sun's center
is pointing a little bit toward the left of the Sun's center
is pointing a little bit toward the right of the Sun's center
is pointing tangential to the circular path
The Fg acting on Earth
changes only the magnitude of the Earth's velocity
changes the magnitude and direction of the Earth's velocity
changes only the direction of the Earth's velocity
doesn't affect the velocity of the Earth
What is the direction of the velocity of the Earth?
to the left
to the right
downward
upward
towards the center of the Sun
What happens when the gravitational Force between the Earth and the Sun is suddenly removed?
The Earth will crash towards the sun
The Earth will follow a linear path directed South in this picture
The Earth will continue to follow a circular path
The Earth will follow a linear path directed West in this picture
Why is the gravitational force between Earth-moon different from the gravitational force between Sun-Earth
because the combined mass of moon and Earth is smaller
because the distance between mass and moon is smaller
both statements above are correct
because the Earth is not radiating energy
The neutrino is a massless particle. Can it interact gravitationally with the Earth?
yes, because the Earth is big enough it can compensate for the massless neutrino
yes, especially when the neutrino is near the Earth's surface
yes, when the neutrino orbits around the Earth
no
Here we halved the distance between the Moon and the Earth. What happens to their Fg?
The Fg is halved
The Fg doubles
The Fg is quadrupled
The Fg is one-fourthed
The distance between the Earth and moon is doubled, what happens to their Fg?
stays the same
doubles
halved
one fourthed
The distance between the Earth and the moon is tripled, what happens to the Fg between them?
1/3 bigger
3 times bigger
1/9 bigger
9 times bigger
Which of the following is true about the Fg between two masses (m1 and m2)?
Fg ∝ m1m2
Fg ∝ m1 + m2
Fg ∝ 1/m1m2
Fg ∝ 1/(m1 + m2)
Which of the following is true about the Fg and the separation distance between two masses
Fg ∝ r
Fg ∝ r2
Fg ∝ 1/r
Fg ∝ 1/r2
Which of the following is true about the Fg between two masses?
Fg ∝ m1m2/r
Fg ∝ r/m1m2
Fg ∝ (m1 + m2)/r
Fg ∝ m1m2/r2
Since Fg ∝ m1m2/r2, there must be a proportionality constant. What should this constant be?
a really big number
a really small number
1
9.8
What does the small proportionality constant (G) for Fg ∝ m1m2/r2 imply?
that two objects with really small masses have negligible Fg between them
that two objects with really small masses have a strong Fg between them
that two objects with really big masses have negligible Fg between them
that Fg only acts between two objects with big masses
Assuming circular orbit, how is the Earth's velocity v related to the radius of orbit r?
v = rα
v = rω
v = r/α
v = r/ω
