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6-7.4 review

Total questions: 60

Worksheet time: 2hrs 43mins

Name
Class
Date
1.

What are the SI units for angular acceleration?

a)

rad/s2

b)

rad/s

c)

s

d)

m/s2

e)

m

2.

What are the SI units for centripetal acceleration?

a)

rad/s2

b)

rad/s

c)

s

d)

m/s2

e)

m

3.

A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the car's velocity?

a)

A

b)

B

c)

C

d)

D

4.

Which vector represents the centripetal acceleration of the ball?

a)

A

b)

B

c)

C

d)

D

5.

An object moves in a perfect circle on the end of a string.  If the string breaks, which letter represents the direction in the object would move in at that instant?

a)

A

b)

B

c)

C

d)

D

6.

A car with mass m travels around a curve with velocity v. What do you know about the centripetal force if the radius doubles?

Fc=mv2rF_c=\frac{mv^2}{r}

a)

Force remains the same

b)

Force doubles

c)

Force divides by 2

d)

Force divides by 4

e)

Force quadruples

7.

A car with mass m travels around a curve with radius r. What do you know about the centripetal force if the linear speed of the car doubles?

Fc=mv2rF_c=\frac{mv^2}{r}

a)

Force remains the same

b)

Force doubles

c)

Force divides by 2

d)

Force divides by 4

e)

Force quadruples

8.

If you are sitting on a carousel that is going a constant angular speed (ω)\left(\omega\right) and you increase your distance from the center (r), what happens to your centripetal acceleration?

ac=mω2ra_c=m\omega^2r

a)

increases

b)

remains the same

c)

decreases

9.
Which model has greater gravitational attraction (if any)
a)
Model A
b)
Model B
c)
Both Model A and Model B (same gravity)
10.

Describe the line's relationship to point P and the circle.

a)

tangent

b)

sine

c)

cosine

d)

chord

e)

cotangent

11.

This is a top view of the Earth going around the Sun. The green vector is the​ (a)   and the blue vector on the Earth is the ​ (b)   from the ​ (c)   .

Choose from the below words
linear speed
force of gravity
Sun
Moon
12.

What is the variable for angular speed?

a)

ω\omega

b)

Δθ\Delta\theta

c)

Δt\Delta t

d)

vv

e)

rr

13.

What are the units for angular speed?

a)

rad/s

b)

rad

c)

s

d)

m/s

e)

m

14.

What are the units for linear speed?

a)

rad/s

b)

rad

c)

s

d)

m/s

e)

m

15.

What is the linear speed of a horse that is 2 m from the center of a merry-go-round spinning at
1/4 rev/s? (Watch your units!)

a)

1/2 m/s

b)

π ms\pi\ \frac{m}{s}

c)

2π ms2\pi\ \frac{m}{s}

d)

1π ms\frac{1}{\pi}\ \frac{m}{s}

e)

2 m/s

16.

Why is gravity in a chapter about rotational motion? Gravity is the ______ force keeping plants in orbit.

a)

centripetal

b)

centrifugal

c)

normal

d)

friction

17.

If the mass of a planet is doubled while keeping the radius of the orbit of a satellite the same, how does the orbital speed of the satellite change?

a)

It doubles.

b)

It increases by a factor of 2\sqrt{2} .

c)

It remains the same.

d)

It decreases by a factor of 2\sqrt{2} .

18.

If the mass of a planet is doubled while keeping the radius of its orbit around the Sun the same, how does the orbital speed of the planet change?

a)

It doubles.

b)

It increases by a factor of 2\sqrt{2} .

c)

It remains the same.

d)

It decreases by a factor of 2\sqrt{2} .

19.

For a satellite orbiting close to the surface of a planet, which factor does not affect its orbital period?

a)

The mass of the satellite

b)

The mass of the planet

c)

The radius of the planet

d)

The gravitational constant

20.

The space shuttle is orbiting the Earth clockwise. Which vector shows the direction of the gravitational force acting on the shuttle?

a)

a

b)

b

c)

c

d)

d

21.

What does rotational inertia primarily measure in a spinning object?

a)

The object's weight distribution

b)

The object's resistance to change in angular speed or axis

c)

The speed at which an object spins

d)

The energy required to stop the object

22.

Which factor increases the rotational inertia of an object?

a)

Decreasing the mass

b)

Increasing the distance between the axis and the mass

c)

Keeping the mass close to the axis

d)

Making the object lighter

23.

Why is it easier to balance an object vertically on your finger if it has more mass at the top?

a)

It has less rotational inertia

b)

It is lighter

c)

It has more rotational inertia

d)

The mass does not affect balancing

24.

What happens to the rotational inertia if the mass is moved closer to the axis of rotation?

a)

It increases

b)

It decreases

c)

It remains the same

d)

It becomes zero

25.

Comparing a solid cylinder and a hoop about the normal axis, which has less rotational inertia?

a)

Solid cylinder

b)

Hoop

c)

Both have the same

d)

Cannot be determined from the given information

26.
Astronauts are weightless on the ISS because
a)
they are in free fall with the ISS around Earth.
b)
there is no gravity in space
c)
the ISS shields them from gravity.
d)
they have antigravity devices.
e)
they are being pulled equally by the Moon.
27.
A girl in an elevator that is not moving feels like her normal weight. If the elevator is accelerating upwards, she feels and the scale reads ____.
a)
a greater weight.
b)
zero because she is weightless.
c)
a lower weight.
d)
her normal weight.
e)
you are the great the way you are.
28.
When spinning a book like the one below, which axis has the smallest amount of rotational inertia?
a)
z
b)
x
c)
y
d)
they are all the same
29.
Ice skaters bring their arms in while spinning to decrease their ________ which increases their _______.
a)
angular speed, rotational inertia
b)
radius, rotational inertia
c)
rotational inertia, angular speed
d)
rotational inertia, radius
30.
What is the variable for angular momentum?
a)
L
b)
r
c)
I
d)
⍵
e)
a
31.
What is the difference between apparent weightlessness and actual weightlessness?
a)
You are in free fall in actual weightlessness.
b)
There is no gravity in apparent weightlessness.
c)
You are in free fall in apparent weightlessness.
d)
There is gravity in actual weightlessness.
32.
A hoop and a solid disk of the same mass and radius race down a hill. The hoop ______ because it has ________.
a)
wins, less rotational inertia
b)
loses, less rotational inertia
c)
wins, more rotational inertia
d)
loses, more rotational inertia
33.
When the axis of a spinning object moves, this is called ____.
a)
precession
b)
axial velocity
c)
radial velocity
d)
angular production
e)
angular migration
34.
True or False: The Earth's axis moves in a circle.
a)
True
b)
False
35.
What happens to her rotational inertia when a figure skater brings in her arms?
a)
Increase her rotational inertia
b)
Decrease her rotational inertia
c)
has no affect
36.
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
37.

The equation for impulse is

a)

FΔtF\Delta t

b)

FΔt\frac{F}{\Delta t}

c)

mv\frac{m}{v}

d)

N·s

38.

A biker with a mass of 60 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?

a)

5 m/s

b)

15 kgm/s

c)

25 kgm/s

d)

300 kgm/s

e)

30 kgm/s

39.

When the speed of an object is doubled, its momentum _____.

a)

remains unchanged

b)

doubles

c)

quadruples

d)

gets divided by 2

e)

gets divided by 4

40.

Impulse is equal to _____.

a)

change in momentum

b)

momentum

c)

force divided by time

d)

mass times acceleration

e)

force divided by acceleration

41.

True or False: If an egg is thrown at 5 mi/h at a wall or to a student to catch and the egg stops in both cases, the change in momentum of both eggs is the same.

a)

False, the egg thrown at the wall has a larger change in momentum

b)

True

c)

False, the egg thrown at the student has a larger change in momentum

42.

If your 2 kg ball undergoes a change in momentum of 20 kgm/s, you applied an impulse of (a)   Ns.

43.

When starting at the same speed, compare a car stopping on a wall vs. a car stopping in a hay stack.

a)

IMPULSE on the car hitting the wall is greater

b)

CHANGE IN MOMENTUM of the car hitting the wall is greater

c)

FORCE on the car hitting the hay stack is greater

d)

COLLISION TIME of the car hitting the hay stack is greater

e)

COLLISION TIME of the car hitting the wall is greater

44.

The point of using a mat during a cheerleading routine is to _____.

a)

increase impact force

b)

increase force

c)

increase collision time

d)

increase change in momentum

45.

When starting at the same speed, compare a car stopping on a wall vs. a car stopping in a hay stack.

a)

IMPULSE on the car hitting the wall is greater

b)

CHANGE IN MOMENTUM of both is the same

c)

FORCE on the car hitting the hay stack is greater

d)

CHANGE IN MOMENTUM of the car hitting the wall is greater

e)

COLLISION TIME of the car hitting the wall is greater

46.

If your 2,000 kg car undergoes a change in momentum of 400 kgm/s, an impulse of (a)   Ns was applied.

47.

When you catch an egg in your hands, you ____ to ______.

a)

increase time,

increase change in momentum

b)

increase time,

decrease change in momentum

c)

decrease time, increase force

d)

decrease time, decrease force

e)

increase time,

decrease force

48.

When you follow through while throwing a ball, you ____ to ______.

a)

increase time,

increase change in momentum

b)

increase time,

decrease change in momentum

c)

decrease time, increase force

d)

decrease time, decrease force

e)

increase time,

decrease force

49.

A 40-kilogram mass is moving right across a horizontal surface at 5.0 m/s.  If the mass is brought to a stop, what is the impulse on the mass?

a)

800 kgm/s

b)

200 kgm/s

c)

-200 kgm/s

d)

-800 kgm/s

e)

-5 kgm/s

50.

True or False: If an egg is thrown at 5 mi/h at a wall or to a student to catch and the egg stops in both cases, the time to stop both eggs is the same.

a)

False, the egg thrown at the wall stops in a longer time

b)

True

c)

False, the egg thrown at the student stops in a longer time

51.

The point of using an airbag in a car is to ____ to ______.

a)

increase time,

increase change in momentum

b)

increase time,

decrease change in momentum

c)

decrease time, increase force

d)

decrease time, decrease force

e)

increase time,

decrease force

52.

Review: Follow through is when you ​ (a)   time by bringing your arm back in order to increase impulse which increases change in ​ (b)   . Higher momentum means more velocity.

Choose from the below words
increase
momentum
decrease
force
53.

Conserved means the total amount remains constant. Momentum is conserved in ​ (a)   collisions without outside forces like friction.​

Choose from the below words
all
elastic
inelastic
perfectly inelastic
54.

When two kids sit at rest on rolling carts and then push off, what is the total final momentum of both kids?

a)

0

b)

9.9

c)

3.3

d)

10

e)

5

55.

When two kids sit at rest on rolling carts and then push off, what is the total initial momentum of both kids?

a)

0

b)

9.9

c)

3.3

d)

10

e)

5

56.
What is one difference between elastic and perfectly inelastic collisions?
a)
perfectly inelastic bounce and elastic stick together
b)
elastic bounce and perfectly inelastic stick together
c)
there is no difference between how the collisions happen
57.

What is confirmation bias?

a)

The tendency to interpret or seek out information that confirms one's preexisting beliefs or hypotheses.

b)

The tendency to interpret or seek out information that challenges one's preexisting beliefs or hypotheses.

c)

The tendency to interpret or seek out information that is neutral and unbiased.

d)

The tendency to interpret or seek out information that contradicts one's preexisting beliefs or hypotheses.

58.

What are some strategies to overcome confirmation bias?

a)

Only seek out information that confirms your existing beliefs

b)

Ignore or dismiss any evidence that contradicts your beliefs

c)

Surround yourself with people who share your beliefs

d)

Challenge your beliefs, and change your mind based on evidence

59.

How does confirmation bias affect the interpretation of information in the media?

a)

Confirmation bias has no impact on the interpretation of information in the media.

b)

Confirmation bias only affects the interpretation of information in personal conversations, not in the media.

c)

Confirmation bias leads to a selective interpretation of information in the media.

d)

Confirmation bias leads to a more objective interpretation of information in the media.

60.

When deciding whether information is true or not that you read, consider the ​ (a)   , read ​ (b)   , check what else the ​ (c)   has said, make sure it is not a ​ (d)   , and look for more ​ (e)   sources with the story or on other sites that are not in your filter bubble.

Choose from the below words
source
the whole story
only the headline
author
joke
supporting
expertise
nonfiction article

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