```Clicker Question
Example 12.3
(x1,y1)
8m
y1
Fsum
F1
(0,0)
F2
m
8m
x1
Clicker Question
The mass of the Moon is 1/81 of the mass of the Earth.
Compared to the gravitational force that the Earth exerts
on the Moon, the gravitational force that the Moon exerts
on the Earth is
A. 812 = 6561 times greater.
B. 81 times greater.
C. equally strong.
D. 1/81 as great.
E. (1/81)2 = 1/6561 as great.
Clicker Question
The mass of the Moon is 1/81 of the mass of the Earth.
Compared to the gravitational force that the Earth exerts
on the Moon, the gravitational force that the Moon exerts
on the Earth is
A. 812 = 6561 times greater.
B. 81 times greater.
C. equally strong.
D. 1/81 as great.
E. (1/81)2 = 1/6561 as great.
Figure 12.14
Figure 12.15
Clicker Question
The planet Saturn has 100 times the mass of the Earth and is
10 times more distant from the Sun than the Earth is.
Compared to the Earth’s acceleration as it orbits the Sun,
the acceleration of Saturn as it orbits the Sun is
A. 100 times greater.
B. 10 times greater.
C. the same.
D. 1/10 as great.
E. 1/100 as great.
Clicker Question
The planet Saturn has 100 times the mass of the Earth and is
10 times more distant from the Sun than the Earth is.
Compared to the Earth’s acceleration as it orbits the Sun,
the acceleration of Saturn as it orbits the Sun is
A. 100 times greater.
B. 10 times greater.
C. the same.
D. 1/10 as great.
E. 1/100 as great.
Clicker Question
Compared to the Earth, Planet X has twice the mass and
twice the radius. This means that compared to the Earth’s
surface gravity, the surface gravity on Planet X is
A. 4 times as much.
B. twice as much.
C. the same.
D. 1/2 as much.
E. 1/4 as much.
Clicker Question
Compared to the Earth, Planet X has twice the mass and
twice the radius. This means that compared to the Earth’s
surface gravity, the surface gravity on Planet X is
A. 4 times as much.
B. twice as much.
C. the same.
D. 1/2 as much.
E. 1/4 as much.
Clicker Question
Compared to the Earth, Planet X has twice the mass and
twice the radius. This means that compared to the amount
of energy required to move an object from the Earth’s
surface to infinity, the amount of energy required to move
that same object from Planet X’s surface to infinity is
A. 4 times as much.
B. twice as much.
C. the same.
D. 1/2 as much.
E. 1/4 as much.
Clicker Question
Compared to the Earth, Planet X has twice the mass and
twice the radius. This means that compared to the amount
of energy required to move an object from the Earth’s
surface to infinity, the amount of energy required to move
that same object from Planet X’s surface to infinity is
A. 4 times as much.
B. twice as much.
C. the same.
D. 1/2 as much.
E. 1/4 as much.
Clicker Question
A satellite is moving around the Earth in a circular orbit.
Over the course of an orbit, the Earth’s gravitational force
A. does positive work on the satellite.
B. does negative work on the satellite.
C. does positive work on the satellite during part of the orbit
and negative work on the satellite during the other part.
D. does zero work on the satellite at all points in the orbit.
Clicker Question
A satellite is moving around the Earth in a circular orbit.
Over the course of an orbit, the Earth’s gravitational force
A. does positive work on the satellite.
B. does negative work on the satellite.
C. does positive work on the satellite during part of the orbit
and negative work on the satellite during the other part.
D. does zero work on the satellite at all points in the orbit.
Clicker Question
Astronauts on the orbiting space station are weightless
because...
A. there is no gravity in space and they do not weigh
anything.
B. space is a vacuum and there is no gravity in a vacuum.
C. space is a vacuum and there is no air resistance in a
vacuum.
D. the astronauts are far from Earth's surface at a
location where gravitation has a minimal affect.
E. There are no surface normal forces
Clicker Question
Astronauts on the orbiting space station are weightless
because...
A. there is no gravity in space and they do not weigh
anything.
B. space is a vacuum and there is no gravity in a vacuum.
C. space is a vacuum and there is no air resistance in a
vacuum.
D. the astronauts are far from Earth's surface at a
location where gravitation has a minimal affect.
E. There are no surface normal forces
Clicker Question
A planet (P) is moving around the Sun
(S) in an elliptical orbit. As the planet
moves from aphelion to perihelion,
the Sun’s gravitational force
A. does positive work on the planet.
B. does negative work on the planet.
C. does positive work on the planet
during part of the motion and
negative work during the other part.
D. does zero work on the planet at
all points between aphelion and
perihelion.
Clicker Question
A planet (P) is moving around the Sun
(S) in an elliptical orbit. As the planet
moves from aphelion to perihelion,
the Sun’s gravitational force
A. does positive work on the planet.
B. does negative work on the planet.
C. does positive work on the planet
during part of the motion and
negative work during the other part.
D. does zero work on the planet at
all points between aphelion and
perihelion.
Clicker Question
A planet (P) is moving around the
Sun (S) in an elliptical orbit. As the
planet moves from aphelion to
perihelion, the planet’s angular
momentum
A. increases during part of the
motion and decreases during the
rest of the motion.
B. increases at all times.
C. decreases at all times.
D. remains the same at all times.
Clicker Question
A planet (P) is moving around the
Sun (S) in an elliptical orbit. As the
planet moves from aphelion to
perihelion, the planet’s angular
momentum
A. increases during part of the
motion and decreases during the
rest of the motion.
B. increases at all times.
C. decreases at all times.
D. remains the same at all times.
Clicker Question
Star X has twice the mass of the Sun. One of Star X’s
planets has the same mass as the Earth, and orbits Star X
at the same distance at which the Earth orbits the Sun.
The orbital speed of this planet of Star X is
A. faster than the Earth’s orbital speed.
B. the same as the Earth’s orbital speed.
C. slower than the Earth’s orbital speed.
D. not enough information given to decide
Clicker Question
Star X has twice the mass of the Sun. One of Star X’s
planets has the same mass as the Earth, and orbits Star X
at the same distance at which the Earth orbits the Sun.
The orbital speed of this planet of Star X is
A. faster than the Earth’s orbital speed.
B. the same as the Earth’s orbital speed.
C. slower than the Earth’s orbital speed.
D. not enough information given to decide
Clicker Question
Suppose the Sun were to shrink to half of its
present radius while maintaining the same mass.
What effect would this have on the Earth’s orbit?
A. The size of the orbit would decrease and
the orbital period would decrease.
B. The size of the orbit would increase and
the orbital period would increase.
C. The size of the orbit and the orbital
period would remain unchanged.
D. none of these
Clicker Question
Suppose the Sun were to shrink to half of its
present radius while maintaining the same mass.
What effect would this have on the Earth’s orbit?
A. The size of the orbit would decrease and
the orbital period would decrease.
B. The size of the orbit would increase and
the orbital period would increase.
C. The size of the orbit and the orbital
period would remain unchanged.
D. none of these
Clicker Question
An object on the end of a spring is oscillating in simple harmonic
motion. If the amplitude of oscillation is doubled, how does this
affect the oscillation period T and the object’s maximum speed vmax?
A. T and vmax both double.
B. T remains the same and vmax doubles.
C. T and vmax both remain the same.
D. T doubles and vmax remains the same.
E. T remains the same and vmax increases by a factor of
.
Clicker Question
An object on the end of a spring is oscillating in simple harmonic
motion. If the amplitude of oscillation is doubled, how does this
affect the oscillation period T and the object’s maximum speed vmax?
A. T and vmax both double.
B. T remains the same and vmax doubles.
C. T and vmax both remain the same.
D. T doubles and vmax remains the same.
E. T remains the same and vmax increases by a factor of
.
Clicker Question
This is an x-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative velocity vx?
A. t = T/4
B. t = T/2
C. t = 3T/4
D. t = T
Clicker Question
This is an x-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative velocity vx?
A. t = T/4
B. t = T/2
C. t = 3T/4
D. t = T
Clicker Question
This is an x-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative acceleration ax?
A. t = T/4
B. t = T/2
C. t = 3T/4
D. t = T
Clicker Question
This is an x-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative acceleration ax?
A. t = T/4
B. t = T/2
C. t = 3T/4
D. t = T
Clicker Question
This is an ax-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative displacement x?
A. t = 0.10 s
B. t = 0.15 s
C. t = 0.20 s
D. t = 0.25 s
Clicker Question
This is an ax-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative displacement x?
A. t = 0.10 s
B. t = 0.15 s
C. t = 0.20 s
D. t = 0.25 s
Clicker Question
This is an ax-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative velocity vx?
A. t = 0.10 s
B. t = 0.15 s
C. t = 0.20 s
D. t = 0.25 s
Clicker Question
This is an ax-t graph
for an object in simple
harmonic motion.
At which of the following times does the object have the most
negative velocity vx?
A. t = 0.10 s
B. t = 0.15 s
C. t = 0.20 s
D. t = 0.25 s
Clicker Question
This is an x-t graph
for an object
connected to a spring
and moving in simple
harmonic motion.
At which of the following times is the potential
energy of the spring the greatest?
A. t = T/8
B. t = T/4
C. t = 3T/8
D. t = T/2
E. more than one of the above
Clicker Question
This is an x-t graph
for an object
connected to a spring
and moving in simple
harmonic motion.
At which of the following times is the potential
energy of the spring the greatest?
A. t = T/8
B. t = T/4
C. t = 3T/8
D. t = T/2
E. more than one of the above
Clicker Question
This is an x-t graph
for an object
connected to a spring
and moving in simple
harmonic motion.
At which of the following times is the kinetic energy
of the object the greatest?
A. t = T/8
B. t = T/4
C. t = 3T/8
D. t = T/2
E. more than one of the above
Clicker Question
This is an x-t graph
for an object
connected to a spring
and moving in simple
harmonic motion.
At which of the following times is the kinetic energy
of the object the greatest?
A. t = T/8
B. t = T/4
C. t = 3T/8
D. t = T/2
E. more than one of the above
Clicker Question
To double the total energy of a mass-spring system
oscillating in simple harmonic motion, the
amplitude must increase by a factor of
A. 4.
B.
C. 2.
D.
E.
Clicker Question
To double the total energy of a mass-spring system
oscillating in simple harmonic motion, the
amplitude must increase by a factor of
A. 4.
B.
C. 2.
D.
E.
Clicker Question
A simple pendulum consists of a point mass
suspended by a massless, unstretchable string.
If the mass is doubled while the length of the string
remains the same, the period of the pendulum
A. becomes 4 times greater.
B. becomes twice as great.
C. becomes greater by a factor of
D. remains unchanged.
E. decreases.
.
Clicker Question
A simple pendulum consists of a point mass
suspended by a massless, unstretchable string.
If the mass is doubled while the length of the string
remains the same, the period of the pendulum
A. becomes 4 times greater.
B. becomes twice as great.
C. becomes greater by a factor of
D. remains unchanged.
E. decreases.
.
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