• #### 1.  The gravitational force between two massive spheres

• is always an attraction.
• depends on how massive they are.
• depends inversely on the square of the distances betwn them.
• all of the above
• #### 2.  If the mass of Earth increased, with no change in radius, your weight would _____.

• increase also
• stay the same
• decrease
• None of these
• #### 3.  In the last question, what is the magnitude of the gravitational force of the car on the Earth?

• less than the force of the Earth on the car
• equal to the force of the Earth on the car
• greater than the force of the Earth on the car
• None of these
• #### 4.  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 stays the same
• #### 5.  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
• #### 6.  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
• #### 7.  Who discovered the Law of Gravitation?

• Thomas Edison
• Albert Einstein
• Isaac Newton
• Galileo Galilei
• #### 8.  If you stood on a ladder so you were twice as far from Earth's center, your weight would be:

• one-eighth its normal value
• one-quarter its normal value
• half its normal value
• none of the above

• Fg ∝ r
• Fg ∝ r2
• Fg ∝ 1/r
• Fg ∝ 1/r2
• #### 10.  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
• #### 11.  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
• #### 12.  What is the direction of the velocity of the Earth?

• to the left
• to the right
• downward
• upward
• towards the center of the Sun
• #### 13.  Jupiter is a much more massive planet than Earth. If you traveled to Jupiter, your mass would

• increase
• decrease
• remain the same
• All of above
• #### 14.  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
• #### 15.  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
• #### 16.  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
• #### 17.  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
• #### 18.  Here both the mass of the Earth and the sun are doubled.

• Fg is doubled
• Fg is tripled
• Fg is reduced by a quarter

• w = m/g
• w =mg2
• w = mg/2
• w = mg
• #### 20.  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
• #### 21.  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
• #### 22.  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 one-fourthed
• #### 23.  The gravitational force

• can be attractive or repulsive
• is tangential to the orbital path
• is always repulsive
• Is always attractive
• #### 24.  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.
• #### 25.  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
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