Q.1
Two objects of different masses falling freely near the surface of the moon would
  • have same velocities at any instant
  • have different acceleration
  • experience forces of same magnitude
  • undergo a change in their inertia
Q.2
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
Q.3
Since Fg ∝ m1m2/rthere must be a proportionality constant. What should this constant be?
  • a really big number
  • a really small number
  • 1
  • 9.8
Q.4
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
Q.5
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
Q.6
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)
Q.7
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
Q.8
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
Q.9
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
Q.10
The gravitational force
  • can be attractive or repulsive
  • is tangential to the orbital path
  • is always repulsive
  • Is always attractive
Q.11
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.
Q.12
Who discovered the Law of Gravitation?
  • Thomas Edison
  • Albert Einstein
  • Isaac Newton
  • Galileo Galilei
Q.13
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
Q.14
The gravitational attraction between an object near the Earth's surface and the Earth.
  • normal force
  • weight
  • friction
  • tension
Q.15
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
Q.16
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
Q.17
A 1000-kg car rests on the Earth. The magnitude of Fg of the Earth on the car is:
  • 6.67 x10-11 N
  • 9.8 N
  • 9800 N
  • 1000 N
Q.18
Suppose Fg between two massive spheres M and m is F. If masses were M and 3m, Fg would be:
  • 1/3F
  • 3F
  • 1/9F
  • 9F
Q.19
Suppose Fg between two massive spheres =N. If distance between spheres is tripled, new Fg=
  • 270 N
  • 10 N
  • 810 N
  • 30 N
Q.20
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
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