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Rotation / Waves Review

Total questions: 69

Worksheet time: 1hrs 9mins

Name
Class
Date
1.
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
a)
her moment of inertia increases and her angular speed decreases.
b)
her moment of inertia decreases and her angular speed increases.
c)
her moment of inertia increases and her angular speed increases.
d)
her moment of inertia increases and her angular speed remains the same.
2.
A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that
a)
the moment of inertia of the system increases and the angular speed increases.
b)
the moment of inertia of the system decreases and the angular speed remains the same.
c)
the moment of inertia of the system decreases and the angular speed decreases.
d)
the moment of inertia of the system decreases and the angular speed increases.
3.
When a rigid object rotates about a fixed axis, what is true about all the points in the object? 
a)
They all have the same tangential acceleration.
b)
They all have the same angular speed.
c)
They all have the same tangential speed.
d)
They all have the same radial acceleration.
4.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
The inside horse
b)
The outside horse
c)
Neither - they both have the same angular speed
5.
The mass of an object ___________ as it moves away from the center of Earth
a)
stays the same
b)
decreases
c)
increases
d)
doubles
6.
The weight of an object _________ as it moves away from the center of Earth.
a)
increases
b)
stays the same
c)
triples
d)
decreases
7.
The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?
a)
A
b)
B
c)
C
d)
D
8.
A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?
a)
cylinder
b)
pipe
c)
sphere
d)
They all reach the bottom at the same time.
9.

Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?

a)

The small sphere arrives first.

b)

The large sphere arrives first.

c)

Both reach the bottom at the same time.

10.
When a fan is turned off, its angular speed decreases from 10 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the average angular acceleration of the fan?
a)
11 rad/s2
b)
0.37 rad/s2
c)
1.2 rad/s2
d)
0.74 rad/s2
11.
Suppose that an astronaut throws a rock in outer space at a location far from significant influences of gravity and air resistance.  One would expect that that the rock would
a)
Eventually stop since all objects ultimately “lose their steam”
b)
Eventually stop as its inertia slowly becomes used up
c)
Continue in motion with the same speed and direction
d)
Either a,b,c… depending on whether the astronaut continues to push it.
12.
If a ball moves with slipping down a ramp
a)
it goes slower than if it had rolled down
b)
it moves faster than if it had rolled down.
c)
It doesn't make a difference about friction or not friction.
d)
Friction slows it down.
13.
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
a)
her moment of inertia increases and her angular speed decreases.
b)
her moment of inertia decreases and her angular speed increases.
c)
her moment of inertia increases and her angular speed increases.
d)
her moment of inertia increases and her angular speed remains the same.
14.
Suppose you are designing an engineless car for a downhill coasting race.  What type of wheels would be the best?
a)
Solid disks.
b)
Hoops.
c)
Hollow cylinders.
d)
Diamond encrusted triangles.
15.
Where is the center of gravity of a softball bat located?
a)
Exactly halfway along the bat
b)
In the thin handle
c)
In the more massive end of the bat
16.
A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record.
a)
True
b)
False
17.
Which would have a greater linear velocity?
a)
Kid near the center of the merry go round
b)
Kid near the outside of the merry go round
c)
neither
18.
A spinning wheel will maintain its state of angular momentum unless acted on by an external torque.
a)
True
b)
False
19.
What force does not cause any torque?
a)
Force perpendicular to the fulcrum, and not on the fulcrum
b)
Force horizontal to the fulcrum, and not on the fulcrum
c)
Force perpendicular to the fulcrum, and slightly off center of the fulcrum
d)
Forces at a 45 degree angle to the fulcrum, and not on the fulcrum
20.
How do you get the maximum torque?
a)
longer lever arm and more force at an acute angle
b)
shorter lever arm with more force perpendicularly
c)
shorter lever arm and more force perpendicularly
d)
longer lever arm with more force perpendicularly
21.

A long rod is suspended by a frictionless bearing near its top. A lump of clay is projected from the right, collides with the block and sticks to it. Which one of the following statements is correct about the clay and rod system for this collision?

a)

The mechanical energy, linear momentum and angular momentum remain constant.

b)

The linear momentum and the angular momentum remain constant but the mechanical energy changes.

c)

Only the angular momentum remains constant.

d)

None of the quantities of mechanical energy, linear momentum, or angular momentum remain constant.

22.
In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?
a)
L/2
b)
L/3
c)
L/4
d)
L/6
23.
A beam with a length of L is lifted from one end with a force of F1.  If the beam doubles in length but contains the same mass, what will the force required to lift it be in terms of F1?
a)
F1
b)
1/2 F1
c)
2 F1
d)
1/4 F1
24.
A construction worker is worried about applying too much torque to a bolt using his wrench.  What could he do to reduce his torque on the bolt?
a)
Increase the length of the wrench
b)
Increase the force on wrench
c)
Reduce the length of the wrench
d)
Reduce the friction between the bolt and wrench
25.
What force is equal to the normal force from the wall acting on the ladder?
a)
Friction from the floor
b)
Normal force from the floor
c)
Friction from the wall
d)
Weight of the ladder
26.
A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?
a)
The larger person moving further away from the center.
b)
Moving the smaller person closer to the center.
c)
Moving the smaller person further from the center.
d)
Making the larger person do nothing.
27.
What direction is the torque acting with respect to post A?
a)
clockwise
b)
Counter clockwise
c)
Neither Direction
d)
Depends on the mass of the diver
28.
The easiest way to open a heavy door  is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
29.

If the net torque on an object is 0, then the object will

a)

not rotate or rotate at a constant angular velocity.

b)

rotate with a constant angular acceleration.

c)

not rotate or move in a straight line.

d)

not move in a straight line.

30.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
The inside horse
b)
The outside horse
c)
Neither - they both have the same angular speed
31.
In order to do a lot of flips an Olympic diver would want:
a)
A high rotational inertia
b)
A low rotational inertia
c)
A low linear acceleration
d)
A low angular velocity
32.
Which wave in the diagram has the greatest frequency?
a)
1
b)
2
c)
3
d)
4
33.
When two waves combine to form a new wave with a larger amplitude, it is called 
a)
Diffraction
b)
Destructive Interference
c)
Resonance
d)
Constructive Interference
34.
What phenomenon does this image demonstrate?
a)
Constructive interference
b)
Destructive interference
c)
Increasing frequency
d)
Increasing period
35.

Look at the diagram. At which positions will the overlapping waves have the most constructive interference?

a)

Positions #1 & #2

b)

Positions #2 & #3

c)

Positions #4 & #5

d)

Positions #6 & #7

36.
The time needed for an object to complete one full cycle of simple harmonic motion is the ____ .
a)
period
b)
frequency
c)
harmonic
d)
amplitude
37.
The maximum distance an object in simple harmonic motion moves from equilibrium is called the ____ .
a)
period
b)
node
c)
amplitude
d)
refraction
38.
Any motion that repeats in a regular cycle is called ____ .
a)
interference
b)
periodic motion
c)
transverse motion
d)
surface motion
39.
A(n) ____ travels in a direction perpendicular to its displacement.
a)
surface wave
b)
longitudinal wave
c)
interference wave
d)
transverse wave
40.
Which harmonic occurs in FIGURE 2
a)
The fundamental
b)
The first
c)
The second
d)
The third
41.
The number of complete oscillations a wave makes each second is the ____ of the wave.
a)
fortitude
b)
amplitude
c)
period
d)
frequency
42.
When a pendulum swings, the highest velocity is observed ...
a)
as it crosses equilibrium
b)
when it is farthest from equilibrium
c)
½ way between the highest and lowest point
d)
to be constant as the pendulum swings.
43.
Sound moves slower under water than through the air.
a)
TRUE
b)
FALSE
44.
When the sound source moves, the frequency changes
ex. police car siren sounding lower pitch after the car passes
a)
pitch
b)
frequency
c)
Doppler Effect
d)
medium
45.
What does pitch depend on?
a)
amplitude 
b)
frequency
c)
intensity 
d)
volume of sound
46.
If the distance represented by the letter A were increased, how would it change the way the sound was heard?
a)
The sound would be higher. 
b)
The sound would be lower. 
c)
The sound would be softer. 
d)
The sound would be louder. 
47.
The _______________ determines the color of visible light. 
a)
wavelength
b)
speed
c)
amplitude
d)
light
48.
After the train passed, the pitch of the train whistle became lower. This change in sound would be represented by what change in the diagram above? 
a)
The distance represented by C would increase. 
b)
The distance represented by C would decrease. 
c)
The distance represented by D would increase. 
d)
The distance represented by D would decrease. 
49.

Sound travels FASTEST through which of these materials?

a)

A type of gas, like helium

b)

Empty space

c)

A metal such as iron

d)

Water

50.

Which is a Transverse Wave?

a)
b)
51.

Which is a Longitudinal Wave?

a)
b)
52.

A wave of amplitude A is traveling through a rope that is fixed on both ends. Which of the following represents the wave upon return?

a)
b)
c)
d)
53.

A wave with amplitude A is traveling through a rope. If the rope is fixed on the left but not on the right, then which of the following represents the wave as it returns?

a)
b)
c)
d)
54.

Two waves of amplitude A are initially traveling in the same direction through a rope that is fixed at both ends. When the two waves meet, the resultant wave will have an amplitude of:

a)

A

b)

A2

c)

2A

d)

0

55.

Which of the following is true about the speed of sound through different mediums?

a)

V(gas) > V(liquid) > V(solid)

b)

V(liquid) > V(gas) > V(solid)

c)

V(solid) > V(liquid) > V(gas)

d)

V(solid) > V(gas) > V(liquid)

56.

This wave is found in/on a

a)

String

b)

Bar or Open Tube

c)

Closed Tube

57.

This string is in the

a)

1st harmonic

b)

2nd harmonic

c)

3rd harmonic

d)

4th harmonic

58.

The length of the tube is 2 meters. How long is the wavelength of the wave?

a)

1 meter

b)

2 meters

c)

1/2 meter

d)

1/4 meter

59.

Which tube, if the same length, would have the lowest frequency?

a)
b)
c)
d)
60.
A mechanical wave cannot travel through...
a)
a vacuum(empty space).
b)
water.
c)
air. 
d)
glass.
61.

A pendulum oscillates as shown. At which of the following positions is the potential energy equal to the total energy?

a)

A

b)

B

c)

C

d)

Not enough information

62.

A pendulum oscillates as shown. At which of the following positions is the kinetic energy equal to the total energy?

a)

A

b)

B

c)

C

d)

Not enough information given.

63.

The graph shows the variation with time of the displacement of an object undergoing simple harmonic motion. At which of the following time values is kinetic energy zero?

a)

0 ms

b)

40 ms

c)

80 ms

d)

100 ms

64.

Which of the following is/ are characteristics of simple harmonic motion?

I. The acceleration is constant .

II. The restoring force is proportional to the displacement.

III. The frequency is independent of the amplitude.

a)

II only

b)

I and II only

c)

I and III only

d)

II and III only

e)

I, II, and III

65.

A simple pendulum swings about the vertical equilibrium position with a maximum angular displacement of 5o and period T. If the same pendulum is given a maximum angular displacement of 10o, then which of the following best gives the period of the oscillations?

a)

T/2

b)

T/√2

c)

T

d)

T√2

e)

2T

66.
A solid  metal bar is at rest on a horizontal frictionless surface. It is free to rotate about a vertical axis at the left end. The figures show forces of different magnitudes that are exerted on the bar at different locations. In which case does the bar's angular speed about the axis increase at the fastest rate?
a)
A
b)
B
c)
C
d)
D
67.
A system consists of a disk rotating on a frictionless axle and a piece of clay moving toward it. The outside edge of the disk is moving at a linear speed v, and the clay is moving at a speed of v/2. The clay sticks to the outside edge of the disk. How does the angular momentum of the system after the clay sticks compare to the angular momentum of the system before the clay sticks, and what is an explanation for the comparison?
a)
It is the same because there is no external torque acting on the system
b)
It is greater because the rotating mass increases, which increase the rotational intertia
c)
It is less because the speed of the disk decreases when the clay sticks to it
d)
It is less because the angular momentum of the clay opposes that of the disk
68.
A stone disk is sliding on a frictionless ice to the west with speed v. As the disk slides by, a child uses a rubber mallet to hit the disk at point X, exerting a force directly toward the center of the disk. The child hits point X every half second for about 10 s, changing the trajectory of the disk but not causing it to rotate. Which of the following most closely approximates the path of the disk while the child is hitting it?
a)
A
b)
B
c)
C
d)
D
69.
Objects moving with constant speed in a circular path experience
a)
constant motion
b)
linear acceleration
c)
angular acceleration
d)
centripetal acceleration

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