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WorksheetsReview: 12, 13, and 14
Total questions: 29
Worksheet time: 50mins
Name
Class
Date
1.
Newton had the insight to see that the ______
a)
moon always keeps one side toward Earth
b)
moon orbits Earth
c)
Force on the moon has the same nature as the force on the apple
d)
none of the above
2.
Newton reasoned that the gravitational attraction between Earth and the moon must be _______
a)
directly proportional to distance
b)
reduced by distance squared
c)
the same at all distances
d)
independent of distance
3.
If the mass of the Earth increased, with no change in radius, your weight would ________
a)
increase also
b)
decrease
c)
stay the same
4.
If the radius of the Earth decreased, with no change in mass, your weight would _______
a)
increase
b)
decrease
c)
stay the same
5.
A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force, if either, is greater?
a)
The force on A
b)
The force on B
c)
Both forces are the same
6.
Suppose the gravitational force between two massive spheres is 10 N. If the distance between the spheres is cut in half, what is the force between the masses?
a)
40 N
b)
20 N
c)
10 N
d)
5 N
7.
The force of gravity acting on you will increase if you _________
a)
burrow deep inside a planet
b)
stand on a planet with a radius that is shrinking
c)
both
d)
none of the these
8.
The reason the moon does not fall into Earth is that ________
a)
Earth's gravitational field at the moon is weak
b)
gravitational pull of other planets keeps the moon up
c)
the moon has a sufficiently large orbital speed
d)
the moon has less mass than the Earth
9.
Each of us weighs a tiny bit less on the ground floor of a skyscraper than we do on the top floor. One reason for this is that _______
a)
the gravitational field is shielded inside the building
b)
the mass of the building attracts you upward slightly
c)
both answers
d)
none of these
10.
Which is more, the gravitational force between Earth and the moon, or between Earth and the sun?
a)
Earth-sun
b)
Earth-moon
c)
equal
11.
A 400-N woman stands on top of a very tall ladder so she is one Earth radius above Earth's surface. How much does she weigh?
a)
zero
b)
100 N
c)
200 N
d)
400 N
12.
By what factor would your weight be multiplied if Earth's diameter were 1/4 as big and Earth's mass remained unchanged?
a)
factor of 4
b)
factor of 8
c)
factor of 16
d)
Nonsense! your weight would be reduced instead of being multiplied
13.
What would a person who weighs 70 N on Earth weigh on planet that has the same mass as Earth but half its radius?
a)
140 N
b)
70 N
c)
210 N
d)
280 N
14.
The acceleration due to gravity (g), ______
a)
depends on the radius of Earth
b)
depends on the mass of Earth
c)
depends on the Universal constant G
d)
all of the above
15.
Gravitational field lines (vectors) show the _______
a)
direction a mass would be accelerated
b)
direction of the field at each point
c)
strength of the field
d)
all of the these
16.
The gravitational field strength at the center of the Earth is _______
a)
large
b)
the same as on the surface
c)
smaller than on the surface but still larger than zero
d)
zero
17.
The acceleration of gravity (g) refers to the ___
a)
rate of acceleration of an object that is acted upon solely by gravity
b)
force of gravity acting upon an object
c)
weight of an object
d)
acceleration of any object when acted upon by some net force
18.
The acceleration of gravity on the surface of the Earth is 9.8 m/s/s. As one moves increasingly further from the surface of the Earth, the acceleration of gravity value _____
a)
remains the same
b)
increases
c)
decreases
d)
...impossible to tell without knowledge of the mass of the object.
19.
The acceleration of gravity upon Earth's surface is 9.8 m/s/s. At a location of "R" above Earth's surface (where "R" is the radius of the Earth), the acceleration of gravity is closest to ______m/s/s.
a)
9.8
b)
4.90
c)
1.09
d)
2.45
20.
The acceleration of gravity upon Earth's surface is 9.8 m/s/s. At a location of "2R" above Earth's surface (where "R" is the radius of the Earth), the acceleration of gravity is closest to ______m/s/s.
a)
4.90
b)
2.45
c)
1.09
d)
9.8
21.
The force of gravitation between any two objects is _________.
a)
always an attractive force
b)
a force which is attractive for one object and repulsive for the other object.
c)
an attractive force on Earth but neither attractive nor repulsive in space
d)
an attractive force which is always balanced by a repulsive force to keep the objects from moving toward each other.
22.
The force of gravitational attraction between the Sun and a planet is dependent upon _______ and ________.
a)
mass of Sun and mass of planet
b)
radius of planet and mass of Sun
c)
radius of Sun and mass of planet
d)
none of these
23.
The force of gravitational attraction between any two objects is ________.
a)
directly proportional to the sum of their masses.
b)
inversely proportional to the product of their masses.
c)
inversely proportional to the square of the distances between their centers
d)
directly proportional to distance between their centers
24.
Suppose that an object weighs 60 Newtons on the surface of the earth (a distance R from its center). If the same object is located a distance of R above Earth's surface, then the force of gravity upon it would be ______ Newtons.
a)
6.67
b)
20.0
c)
30.0
d)
15.0
25.
TRUE OR FALSE:
The acceleration of gravity experienced by objects located near to (and far from) from the earth depends upon the mass of the object
The acceleration of gravity experienced by objects located near to (and far from) from the earth depends upon the mass of the object
a)
TRUE
b)
FALSE
26.
The acceleration of gravity (g) refers to ______.
a)
gravity
b)
weight of an object
c)
force of gravity acting upon an object
d)
rate of acceleration of an object which is acted upon solely by gravity
27.
TRUE OR FALSE:
All satellites follow a circular path
All satellites follow a circular path
a)
TRUE
b)
FALSE
28.
Which statement is true about the motion of planets about the sun?
a)
The net force vector is at all times directed perpendicular to the velocity vector.
b)
To keep the planet from escaping the sun's gravitational field, the net force vector is greatest when the planet is furthest from the sun.
c)
The velocity vector is directed tangent to the elliptical path
d)
none of these statements is true
29.
Two objects attract each other with a force of gravity (Fgrav) of 36 N. If the distance separating the objects is increased by a factor of 4 and the masses of both objects is tripled, then what is the new force of gravitational attraction.
a)
6.75 N
b)
20.3 N
c)
81.0 N
d)
27.0 N
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