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Quiz 2
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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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