1
You should be able to complete the two quizzes (A and B) in the 50 minutes.
However, if you need more time, you are free to stay after class if youd like.
If you anticipate needing more time and cannot stay (due to other classes or
conicts), let me know
1
1. c (the bullet red downward has a non-zero vertical velocity whereas
the bullet red horizontally has a zero vertical velocity)
2. d (the horizontal velocity is the same as what it was on the table)
3. d (since there is no horizontal acceleration durin
1
1. d (both objects are traveling at a constant speed and direction)
2. a
3. d (at that moment, the objects velocity is zero but it will not stay at
zero)
4. b (for slowing down, the acceleration is opposite the velocity)
5. 44.1 m
The physics says that,
1
1. a
2. e
3. d
4. e
5. c
6. a
7. a
8. e
9. d
10. c
11. b
12. 50 N
The physics says that there has to be a force imbalance on your friends
car because it is not maintaining a constant velocity (i.e., it is accelerating). The value of the acceleration is
1
1. b (for an object moving in a circle, the net force must be directed
toward the center of the circle)
2. b (for an object moving in a circle, the net force must be directed
toward the center of the circle)
3. c (use the radius of the circular path the
1
1. b (From Newtons second law, the net torque is equal to the rotational
inertia times the angular acceleration; so, the correct choice must correspond to the situation where the torque is maximum. Since the torque
is dened as the tangential force times
1
1. e (There are a couple ways to do this. The simplest way is to recognize
that the maximum velocity is equal to 2A/T , where A is the amplitude
and T is the period. The period is is independent of the amplitude so
if the amplitude doubles then so does
1
1. e (the total momentum is conserved, not the velocity; the best way to
approach this is to recognize that we dont even know the direction the
blocks will move. They will move toward the left after the collision if
block Bs momentum to the left is grea
1
1. c (total energy is conserved and has to be converted to another type
of energy; gravitational energy doesnt change, or goes down slightly,
during the time when the textbook is in contact with the ground, and
no light is produced)
2. a (since the velo
1
1. e
2. c
3. a (nothing is touching the coin so the only force acting on it is the
gravitational force due to its interaction with Earth and that doesnt
change during the ight)
4. 1.28 s (rst use newtons second law to show that the normal force must
bal
1
1. b (it must be greater than either 5, the eastward component, or 10
m, the southward component, and less than 15 m, the sum of the two
components, 10 m and 5 m)
2. (a) There are two forces acting on the box: the gravitational force
pulling straight do