Gravitation
Practice Test
1.
The attractive force that exists between all objects is known as __________.
a.
centripetal force
b.
the normal force
c.
gravitational force
d.
torque
Hint
2.
Two balls have their centers 3.0 m apart. One ball has a mass of 2.7 kg. The other has a mass of 4.5 kg. What is the gravitational force between them? Assume
G
= 6.67×10
-11
N·m
2
/kg
2
.
a.
2.7×10
-10
N
b.
9.0×10
-10
N
c.
1.3×10
-11
N
d.
9.0×10
-11
N
Hint
3.
When Uranus was discovered, why didn't Newton's law of gravitation correctly predict its orbit?
a.
The period of Uranus was not known at the time.
b.
Uranus was being attracted by the planet Neptune.
c.
Newton's law could not be applied over such great distances.
d.
Newton's law of gravitation applies only to objects on Earth.
Hint
4.
If you weigh 500.0 N on Earth's surface, how much would you weigh on the planet Jupiter? Jupiter has a mass of 1.90×10
27
kg and a radius of 71.5×10
6
m.
a.
1.24×10
4
N
b.
1.26 N
c.
1270 N
d.
126 N
Hint
