Question 1

When you go over the crest of a hill in a roller coaster, a force appears to lift you up out of your seat. This is a fictitious force.

Accepted Answer

A) True 
 B)False

Question 2

An object's $x$-acceleration $a_{x}(t)$ is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its $x$-velocity?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 3

Suppose that a comet goes around the sun in an elliptical orbit such that the comet at the farthest point in its orbit is 3 times as far from the sun as it is when it is at its closest point. How many times stronger is the gravitational force on the comet due to the sun when it is at its closest point than when it is at its farthest?

Accepted Answer

A)  $\left|\overrightarrow{F_{g}}\right|$ is the same at both positions. 
B)  $\sqrt{3}$ times stronger 
C)  3 times stronger 
D)  9 times stronger 
E)  27 times stronger
F) The answer depends on the relative masses of the comet and the sun.

Question 4

The drawing shown is supposed to be a free-body diagram of a crate that is being lowered by a crane and is speeding up as it is being lowered. Is the diagram correct? (Ignore air resistance.)

Accepted Answer

A)  Yes. 
B)  No, $\vec{F}_{T}$ should be labeled $\vec{F}_{N}$ 
C)  No, $\left|\vec{F}_{T}\right|$ should be equal to $\left|\vec{F}_{g}\right|$. 
D)  No, $\left|\vec{F}_{T}\right|$ should be greater than $\vec{F}_{K F}$ 
E)  No, there should be an upward drag force $\left|\vec{F}_{D}\right|$
F) No, there is some other problem (specify).

Question 5

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed.
  
At the point shown, use the arrow choices shown to the right to indicate the direction of
-The gravitational force on the earth due to the moon. (To choose a double-letter answer using the letters on the back of the book, point with two fingers to the letter.)

Accepted Answer

The answer of The diagram below shows a top view...

Question 6

An object can have zero velocity (at an instant) and still be accelerating.

Accepted Answer

A) True 
 B)False

Question 7

According to the text, an orbiting object having energy $E<0$ follows an elliptical orbit. When we specify the numerical value for an object's energy, we are implicitly comparing it to the energy the object has in some reference situation. So, when we say that $E<0$ in this case, we are comparing the energy of the orbiting object to the energy of an object with the same mass that is

Accepted Answer

A)  At rest at the primary's center. 
B)  At rest on the primary's surface. 
C)  In a circular orbit just above the primary's surface. 
D)  At rest at $r=\infty$. 
E)  Some other situation (specify).

Question 8

Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?

Accepted Answer

A)  $9.8 \mathrm{~m} / \mathrm{s}^{2}$ 
B)  $-9.8 \mathrm{~m} / \mathrm{s}^{2}$ 
C)  $0<|\vec{a}|<9.8 \mathrm{~m} / \mathrm{s}^{2}$ 
D)  0 
E)  Other (specify)

Question 9

Suppose we know the value of $\omega$ for a simple harmonic oscillator. What further information do we need to know to fix the amplitude $A$ and the initial phase $\theta$ in the solution to the simple harmonic oscillator equation? (If more than one item is needed, feel free to indicate more than one answer.)

Accepted Answer

A)  The oscillating object's initial position 
B)  The oscillating object's initial velocity 
C)  The object's mass 
D)  The oscillation's period 
E)  The spring's spring constant
F) We do not need additional information.
G) The oscillating object's initial(position+velocity)

Question 10

A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram? (Hint: Draw a free-body diagram for the scale in each case.)
-

Accepted Answer

A)  $49 \mathrm{~N}$ 
B)  $98 \mathrm{~N}$ 
C)  $196 \mathrm{~N}$ 
D)  Other (specify)

Question 11

Do the following statements about the physical world express
-A heavy object falls faster than a light object.
A)a primarily Aristotelian viewpoint .
B)aprimarily Newtonian viewpoint.
C)are they consistent with both viewpoints

Accepted Answer

The answer of Do the following statements about the physical...

Question 12

In the situation described in problem N12T.6, what do you think will happen to the satellite's speed as time passes?

Accepted Answer

A)  It slowly decreases. 
B)  It remains roughly the same. 
C)  It slowly increases.

Question 13

Suppose an object is hanging from the end of a spring. Let the spring's length when the object is hanging at rest be L. Now suppose we pull the object downward until the spring has been stretched a length of $2 \mathrm{~L}$. By what factor has the force that the spring is exerting on the object increased?

Accepted Answer

A)  The spring force is the same in both cases. 
B)  $\sqrt{2}$ times stronger 
C)  2 times stronger 
D)  4 times stronger 
E)  The answer depends on the spring's relaxed length.

Question 14

A glider on an air track is connected by a spring to the end of the air track. If it is pulled $3.5 \mathrm{~cm}$ in the $+x$ direction away from its equilibrium point and then released from rest at $t=0$, what is the initial phase $\theta$ ?

Accepted Answer

A)  0 
B)  $\pi / 4$ 
C)  $\pi / 2$ 
D)  $\pi$ 
E)  $3 \pi / 2$
F) Some other result (specify)

Question 15

Suppose you are preparing an actual-size trajectory diagram of a freely falling object. The time interval between positions is $0.02 \mathrm{~s}$. How long should you draw the acceleration arrows on your diagram?

Accepted Answer

A)  $9.8 \mathrm{~m}$ 
B)  $0.20 \mathrm{~m}$ 
C)  $0.04 \mathrm{~m}$ 
D)  $3.9 \mathrm{~cm}$ 
E)  $0.39 \mathrm{~cm}$
F) Other (specify)

Question 16

The coefficient of static friction between Teflon and scrambled eggs is about 0.1. What is the smallest tilt angle from the horizontal that will cause the eggs to slide across the surface of a tilted Teflon-coated pan?

Accepted Answer

A)  $0.002^{\circ}$ 
B)  $5.7^{\circ}$ 
C)  $15^{\circ}$ 
D)  $33^{\circ}$ 
E)  Other (specify)

Question 17

A parent pushes a small child on a swing so that the child moves rapidly away while the parent remains at rest. How does the magnitude of the force that the child exerts on the parent compare to the magnitude of the force that the parent exerts on the child?

Accepted Answer

A)  The force on the child is larger in magnitude. 
B)  The force on the parent is larger in magnitude. 
C)  These forces have equal magnitudes. 
D)  The child exerts zero force on the parent. 
E) There is no way to tell.

Question 18

In a Western movie, a person shoots an arrow backward from a fleeing horse. If the velocity of the horse relative to the ground is $13 \mathrm{~m} / \mathrm{s}$ west and the arrow's velocity relative to the horse is $38 \mathrm{~m} / \mathrm{s}$ east, what is the arrow's velocity with respect to the ground?

Accepted Answer

A)  $41 \mathrm{~m} / \mathrm{s}$ east 
B)  $41 \mathrm{~m} / \mathrm{s}$ west 
C)  $25 \mathrm{~m} / \mathrm{s}$ east 
D)  $25 \mathrm{~m} / \mathrm{s}$ west

Question 19

Imagine that a certain engine can cause the road to exert a certain maximum forward force $\left|\vec{F}_{S F}\right|$ on a certain car. If we change the car's design to reduce its drag coefficient by a factor of 2 , by what factor will the car's maximum speed increase (other things being equal)?

Accepted Answer

A)  No increase 
B)  1.41 
C)  2 
D)  4 
E)  Depends (specify)
F) Other (specify)

Question 20

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not.
-A motorboat propeller pushes backward on the water; the water pushes forward on the propeller.

Accepted Answer

A) True 
 B)False

Exam 2: The Laws of Physics Are Universal Newtonian Mechanics

When you go over the crest of a hill in a roller coaster, a force appears to lift you up out of your seat. This is a fictitious force.

An object can have zero velocity (at an instant) and still be accelerating.

Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?

Do the following statements about the physical world express -A heavy object falls faster than a light object. A)a primarily Aristotelian viewpoint . B)aprimarily Newtonian viewpoint. C)are they consistent with both viewpoints

In the situation described in problem N12T.6, what do you think will happen to the satellite's speed as time passes?

A glider on an air track is connected by a spring to the end of the air track. If it is pulled $3.5 \mathrm{~cm}$ in the $+x$ direction away from its equilibrium point and then released from rest at $t=0$ , what is the initial phase $\theta$ ?

Suppose you are preparing an actual-size trajectory diagram of a freely falling object. The time interval between positions is $0.02 \mathrm{~s}$ . How long should you draw the acceleration arrows on your diagram?

The coefficient of static friction between Teflon and scrambled eggs is about 0.1. What is the smallest tilt angle from the horizontal that will cause the eggs to slide across the surface of a tilted Teflon-coated pan?

A parent pushes a small child on a swing so that the child moves rapidly away while the parent remains at rest. How does the magnitude of the force that the child exerts on the parent compare to the magnitude of the force that the parent exerts on the child?

Imagine that a certain engine can cause the road to exert a certain maximum forward force $\left|\vec{F}_{S F}\right|$ on a certain car. If we change the car's design to reduce its drag coefficient by a factor of 2 , by what factor will the car's maximum speed increase (other things being equal) ?

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A motorboat propeller pushes backward on the water; the water pushes forward on the propeller.

Exam 2: The Laws of Physics Are Universal Newtonian Mechanics

When you go over the crest of a hill in a roller coaster, a force appears to lift you up out of your seat. This is a fictitious force.

An object's xxx -acceleration ax(t) a_{x}(t) ax​(t) is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its xxx -velocity?

The drawing shown is supposed to be a free-body diagram of a crate that is being lowered by a crane and is speeding up as it is being lowered. Is the diagram correct? (Ignore air resistance.)

An object can have zero velocity (at an instant) and still be accelerating.

Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?

A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram? (Hint: Draw a free-body diagram for the scale in each case.) -

Do the following statements about the physical world express -A heavy object falls faster than a light object. A)a primarily Aristotelian viewpoint . B)aprimarily Newtonian viewpoint. C)are they consistent with both viewpoints

In the situation described in problem N12T.6, what do you think will happen to the satellite's speed as time passes?

A glider on an air track is connected by a spring to the end of the air track. If it is pulled 3.5 cm3.5 \mathrm{~cm}3.5 cm in the +x+x+x direction away from its equilibrium point and then released from rest at t=0t=0t=0 , what is the initial phase θ\thetaθ ?

Suppose you are preparing an actual-size trajectory diagram of a freely falling object. The time interval between positions is 0.02 s0.02 \mathrm{~s}0.02 s . How long should you draw the acceleration arrows on your diagram?

The coefficient of static friction between Teflon and scrambled eggs is about 0.1. What is the smallest tilt angle from the horizontal that will cause the eggs to slide across the surface of a tilted Teflon-coated pan?

A parent pushes a small child on a swing so that the child moves rapidly away while the parent remains at rest. How does the magnitude of the force that the child exerts on the parent compare to the magnitude of the force that the parent exerts on the child?

Which of the following pairs of forces are third-law partners? Answer T\mathrm{T}T if the two forces described are third-law partners, F\mathrm{F}F if they are not. -A motorboat propeller pushes backward on the water; the water pushes forward on the propeller.

A glider on an air track is connected by a spring to the end of the air track. If it is pulled $3.5 \mathrm{~cm}$ in the $+x$ direction away from its equilibrium point and then released from rest at $t=0$ , what is the initial phase $\theta$ ?

Suppose you are preparing an actual-size trajectory diagram of a freely falling object. The time interval between positions is $0.02 \mathrm{~s}$ . How long should you draw the acceleration arrows on your diagram?

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A motorboat propeller pushes backward on the water; the water pushes forward on the propeller.