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Circular Motion

Total questions: 110

Worksheet time: 2hrs 55mins

Name
Class
Date
1.

Centripetal force is an acceleration of an object moving in circular path whose direction is _________________________of the circular path and whose magnitude is equal to the square of the speed divided by the radius.

a)

towards the tangent

b)

towards the centre

c)

towards the minimum point

d)

towards the maximum point

2.

Where is the net force when the rollercoaster is at the top of the loop?

a)

Towards the sky

b)

Towards the Right

c)

Towards the left

d)

Towards the center of the circle

3.

In uniform circular motion, the magnitude of the _______________________of an object is constant but the __________ is continually changing.

a)

speed, acceleration

b)

speed, direction

c)

acceleration, speed

d)

acceleration, velocity

4.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
5.
Which statement is true about an object that is traveling in uniform circular motion?
a)
The speed of the object varies.
b)
The net force on the object is directed toward the center of the circular path.
c)
The direction of the object's velocity is constant.
d)
The net force on the object is directed away from the center of the circular path.
6.
Centripetal acceleration always points
a)
in the direction of the object's motion
b)
in the opposite direction of the object's motion
c)
towards the center of the circle
d)
towards the outside of the circle
7.

________________________ defined as the number of revolutions (cycles/rotations) completed in one second.

a)

frequency

b)

period

c)

distance

d)

centripetal acceleration

8.
Which of the following is the unit for centripetal force?
a)
J
b)
m/s2
c)
kg⋅m/s
d)
N
9.
The time taken for one complete circuit is called the... 
a)
Period
b)
Frequency 
c)
Angular velocity
10.
Which represents the acceleration of the ball?
a)
A
b)
B
c)
C
d)
D
11.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
12.

If an object is spinning around on a string and the string was suddenly cut, the object would move in a

a)

curved path

b)

straight line

13.

Why does an object experiencing uniform circular motion have an acceleration?

a)

because it ir changing speed

b)

because it is changing direction

c)

because it is moving n a straight line

d)

because it has mass

14.

The _______________________ supplies the centripetal force requirement for the car to move in a horizontal circle. Without it, the car would turn its wheels but would not move in a circle (as is the case on an icy surface).

a)

friction force

b)

centrifugal force

c)

normal force

d)

applied force

15.

In this diagram, what do the red arrows represent?

a)

the acceleration vector

b)

the velocity vector

c)

the centripetal force vector

d)

the force of gravity

16.

moving or tending to move toward a center...

a)

centripetal force

b)

centrifugal force

c)

Tangent

d)

Curvature

17.

the process or act of turning or circling around something

a)

Curvature

b)

Rotation

c)

Radius

d)

Orbit

18.

Which bucket has more inertia?

a)

The bucket on the left because it has less mass

b)

The bucket on the right because it has more mass

c)

They have the same inertia

d)

The bucket on the right because it has less mass

19.

Which bucket would take less force?

a)

The bucket on the left because it has less mass

b)

The bucket on the right because it has more mass

c)

They have the same inertia

d)

The bucket on the left because it has more mass

20.
You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?
a)
Friction
b)
Centripetal Force
c)
Gravity
d)
Inertia
21.
Where is the net force when the rollercoaster is at the top of the loop?
a)
Towards the sky
b)
Towards the Right
c)
Towards the left
d)
Towards the ground
22.
What is the net force?
a)
10 N
b)
0 N
c)
25 N
d)
1 N
23.
If these teams are pulling with the same amount of force what will happen?
a)
The boy in blue will win.
b)
They will not move at all.
c)
The boy in red will win.
d)
Both will fall down.
24.
Balanced or Unbalanced?
a)
Balanced 
b)
Unbalanced
25.
What is the formula for force?
a)
F=M/A
b)
F=A/M
c)
F=M*A
d)
F=M*F
26.
Two balls that collide will have an equal but opposite force upon one another
a)
First Law
b)
Second Law
c)
Third Law
d)
Law of Inertia
27.
What is the tendency of an object to resist a change in motion?
a)
coffee
b)
motion
c)
inertia
d)
gravity
28.
A rocket with less ________ will have a greater acceleration.
a)
Mass
b)
At Rest
c)
Reaction
d)
Resist
29.

When two equal forces act in opposite directions on an object, they are called ______________________.

a)

frictional force

b)

balanced force

c)

centripetal force

d)

gravitational force

30.

When an unbalanced force acts on an object, the force ______________________.

a)

changes the motion of the object

b)

is cancelled by another force

c)

does not change the motion of an object

d)

is equal to the weight of the object

31.

The picture is an example of Newton's...

a)

1st Law

b)

2nd Law

c)

3rd Law

32.
Any push or pull on an object.
a)
force
b)
velocity 
c)
inertia
d)
momentum
33.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
34.
Centripetal acceleration acts towards the ___________ of the circular motion
a)
centre
b)
circumference
35.
What object experiences uniform circular motion?
a)
A car speeding up as it turns left
b)
A car traveling around a roundabout at a constant speed
c)
A car slowing down as it crests a tall hill
d)
A car traveling down the road at a constant speed
36.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
37.

When a car goes around a circular curve on a level road, ...

a)

no frictional force is needed because the car simply follows the road.

b)

the frictional force of the road on the car increases when the car's speed decreases.

c)

the frictional force of the road on the car increases when the car's speed increases.

d)

the frictional force of the road on the car increases when the car moves to the outside of the curve.

38.

Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5m/s23.5m/s^2 .

a)

2.4 m/s 2.4\ m/s\  

b)

3.6 m/s3.6\ m/s  

c)

3.9 m/s3.9\ m/s  

d)

4.2 m/s4.2\ m/s  

39.

When moving in a horizontal circular path, what direction is acceleration?

a)

In the opposite direction of motion

b)

Tangential to the circle in the direction of motion

c)

Outwards from the center of the circle

d)

Towards the center of the circle

40.
Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.
a)
10 N
b)
20 N
c)
30 N
d)
40  N
41.

How is acceleration seen in circular motion?

a)

Velocity increases as the object travels in a circle.

b)

Velocity decreases as the object travels in a circle.

c)

The object changes direction as it travels in a circle.

d)

There is no acceleration as an object travels in a circle.

42.

A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?

a)
b)
c)
d)
43.
Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.
a)
10 N
b)
20 N
c)
30 N
d)
40  N
44.

A bicycle has a period of 0.3s . What is the

speed of its tires if their radius is 30 cm?

a)

6 m/s

b)

3 m/s

c)

60 m/s

d)

30 m/s

45.
If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)
a)
9.4 m/s
b)
6.8 m/s
c)
11.7 m/s
d)
3.5 m/s
46.
What is the linear motion of an object when it is undergoing circular motion?
a)
linear velocity is constant
b)
speed and linear velocity is constant
c)
speed is constant but linear velocity is changing
d)
speed is changing but linear velocity is constant
47.

What causes centripetal acceleration?

a)

Change in magnitude

b)

Change in the direction of the velocity vector

c)

Change in angular displacement

d)

change in position

48.
Which represents the acceleration of the ball?
a)
A
b)
B
c)
C
d)
D
49.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
50.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
51.
Which statement is true about an object that is traveling in uniform circular motion?
a)
The speed of the object varies.
b)
The net force on the object is directed toward the center of the circular path.
c)
The direction of the object's velocity is constant.
d)
The net force on the object is directed away from the center of the circular path.
52.
Centripetal acceleration always points
a)
in the direction of the object's motion
b)
in the opposite direction of the object's motion
c)
towards the center of the circle
d)
towards the outside of the circle
53.
You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?
a)
Friction
b)
Centripetal Force
c)
Gravity
d)
Inertia
54.

Centrifugal force is a ______

a)

force that pushes you to the outside of a circle during uniform circular motion.

b)

fictitious force that is really just the linear motion of an object in uniform circular motion.

c)

The force that keeps the planets in orbit

55.

What is the velocity formula for uniform circular motion?

a)
b)
c)
d)
56.
Centripetal acceleration is ...
a)
Acceleration toward the center of a curved or circular path
b)
Acceleration toward the outside of a circle
c)
Vertical motion instead of horizontal motion
57.
Which of the following is the unit for centripetal force?
a)
J
b)
m/s2
c)
kg⋅m/s
d)
N
58.
The time taken for one complete circuit is called the... 
a)
Period
b)
Frequency 
c)
Angular velocity
59.
Is it possible for an object moving with a constant speed to accelerate?  Explain. 
A) No, if the speed is constant then the acceleration is equal to zero.  B) No, an object can accelerate only if there is a net force acting on it.  
C) Yes, although the speed is constant, the direction of the velocity can be changing.  
D) Yes, if an object is moving it can experience acceleration 
a)
A
b)
B
c)
C
d)
D
60.
An object moves in a circular path at a constant speed.  Compare the direction of the object's velocity and acceleration vectors.    
A) Both vectors point in the same direction.  
B) The vectors point in opposite directions.  
C) The vectors are perpendicular.  
D) The question is meaningless, since the acceleration is zero
a)
A
b)
B
c)
C
d)
D
61.
When an object experiences uniform circular motion, the direction of the acceleration is     
A) in the same direction as the velocity vector.  
B) in the opposite direction of the velocity vector.  
C) is directed toward the center of the circular path.   D) is directed away from the center of the circular path. 
a)
A
b)
B
c)
C
d)
D
62.
When an object experiences uniform circular motion, the direction of the net force is      A) in the same direction as the motion of the object.  
B) in the opposite direction of the motion of the object.  
C) is directed toward the center of the circular path.   D) is directed away from the center of the circular path. 
a)
A
b)
B
c)
C
d)
D
63.

Which law determines the direction of an object's velocity as it is moving in uniform circular motion?

a)

Newton's First Law

b)

Newton's Second Law

c)

Newton's Third Law

d)

The Universal Law of Gravitation

64.

Which law determines the direction of an object's acceleration as it is moving in uniform circular motion?

a)

Newton's First Law

b)

Newton's Second Law

c)

Newton's Third Law

d)

The Universal Law of Gravitation

65.

The term centripetal means

a)

circular motion

b)

center accepting

c)

center seeking

d)

center fleeing

66.

The term centrifugal means

a)

circular motion

b)

center accepting

c)

center seeking

d)

center fleeing

67.

A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?

a)
b)
c)
d)
68.

Identify the force that determines the centripetal force as a car is turning a corner.

a)

Friction Force

b)

Tension Force

c)

Normal Force

d)

Centripetal Force

69.

Other than gravity what is the other force that is contributing to the net force of the coaster at the top of the loop?

a)

Tension Force

b)

Friction Force

c)

Centripetal Force

d)

Normal Force

70.

A pilot experiences centripetal acceleration of 2g's (2 x 9.8 m/s2) while maneuvering a loop at a speed of 400 m/s. What is the radius of the loop?

a)

203 m

b)

8163 m

c)

80,003 m

d)

23 m

71.
What is the SI unit for circumference?
a)
meter
b)
pi
c)
inches
d)
kilometer
72.
What happens to the centripetal force exerted on an object if you triple the velocity?
a)
it increases to 3X
b)
it decreases to 6X
c)
it increases to 6X
d)
it increases to 9X
73.

A satellite of mass m and speed v orbits the Earth at a distance r from the center of the Earth. The gravitational acceleration due to the Earth at the satellite is equal to.

a)

v/r

b)

v2/r

c)

mv/r

d)

mv2/r

74.
Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s2.
a)
2.4 m/s
b)
3.6 m/s
c)
3.9 m/s
d)
4.2 m/s
75.
Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.
a)
10 N
b)
20 N
c)
30 N
d)
40  N
76.

Centripetal force is...

a)

the inward force acting on a body moving at constant speed in a circle

b)

the outwards force acting on a body moving at constant speed in a circle

77.
Centripetal acceleration acts towards the ___________ of the circular motion
a)
centre
b)
circumference
78.
A horse gallops around a circular arena.  The centripetal force on the horse is ___.
a)
directed outward
b)
tension
c)
directed toward the center of the arena
d)
9.8 N
79.

A ball is moving at constant speed around the circle. Which letter represents the acceleration of the ball?

a)

A

b)

B

c)

C

d)

D

e)

Nonsense. The ball can't be accelerating while moving at a constant speed.

80.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
81.
Calculate the mass of an object if it took 20 N to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s
a)
4.1 kg
b)
3.6 kg
c)
2.5 kg
d)
1.8 kg
82.

Why do objects experience centripetal acceleration even though they can have a constant speed?

a)

Because they are speeding up as they move in a circle

b)

Because they are constantly changing direction and hence, velocity changes, and that net change is directed inward.

c)

Because they are constantly changing both speed and direction

d)

Because when you have 100 people pedaling, you can speed up more easily.

83.
A test car moves at a constant speed around a circular track.  If the car is 48.2 m from the track's center and has a centripetal acceleration of 8.05 m/s2, what is the car's tangential speed?
a)
19.7 m/s
b)
5.99 m/s
c)
0.17 m/s
d)
388.01 m/s
84.

The linear velocity is always _____ to the line of a circle.

a)

outwards

b)

towards the center

c)

tangent

d)

faster

85.

Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5m/s23.5m/s^2 .

a)

2.4 m/s 2.4\ m/s\  

b)

3.6 m/s3.6\ m/s  

c)

3.9 m/s3.9\ m/s  

d)

4.2 m/s4.2\ m/s  

86.
Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.
a)
10 N
b)
20 N
c)
30 N
d)
40  N
87.

A bicycle has a period of 0.3s . What is the

speed of its tires if their radius is 30 cm?

a)

6 m/s

b)

3 m/s

c)

60 m/s

d)

30 m/s

88.
If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)
a)
9.4 m/s
b)
6.8 m/s
c)
11.7 m/s
d)
3.5 m/s
89.
Calculate the mass of an object if it took 20 N to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s
a)
4.1 kg
b)
3.6 kg
c)
2.5 kg
d)
1.8 kg
90.
What is 5π/6 radians in degrees?
a)
180
b)
150
c)
360
d)
120
91.
A fan spins with a constant angular speed of 500 radians/second. How long will it take to cover an angle of 2π radians (one revolution)?
a)
0.013 s
b)
0.002 s
c)
76.9 s
d)
6.28 s
92.

A 0.50 kilogram object moves in a horizontal circular path with a radius of 0.25 meter at a constant speed of 4.0 meters per second. What is the magnitude of the object’s acceleration?

a)

8 m/s2

b)

32 m/s2

c)

16 m/s2

d)

64 m/s2

93.

Ali is rotating a stone suspended by a thread of a length r . If the speed of rotation is 2m/s and the periodic time is 0.5s. What is the length of the thread ?

a)

r= 0.16 m

b)

r= 6.28 m

c)

r= 1 m

d)

r= 0.31 m

94.

If a rubber stopper completes 20 revolutions in 10 seconds, what is the period?

a)

0.5 s

b)

2 s

c)

10 s

d)

20 s

95.
What happens to the centripetal force exerted on an object if you triple the velocity?
a)
it increases to 3X
b)
it decreases to 6X
c)
it increases to 6X
d)
it increases to 9X
96.

A race car completes three laps of a circular track with a radius of 35 m in 9.0 seconds. Determine the speed of the car.

a)

3.9 m/s

b)

73.3 m/s

c)

24.4 m/s

d)

1.0 m/s

97.

A particle of mass 0.01 kg moves in a horizontal circle of diameter 1 m with an angular velocity of 3π

rad s-1.

What is the magnitude of the force responsible for this motion?

a)

0.03 π

b)

0.09 π

c)

0.03 π2

d)

0.09 π2

98.

A particle of mass 0.01 kg moves in a horizontal circle of diameter 1 m with an angular velocity of 3π

rad s-1.

What is the magnitude of the force responsible for this motion?

a)

0.03 π

b)

0.09 π

c)

0.03 π2

d)

0.09 π2

99.

A particle of mass 0.01 kg moves in a horizontal circle of diameter 1 m with an angular velocity of 3π

rad s-1.

What is the direction of the force responsible for this motion?

a)

away from the centre of the circle

b)

towards the centre of the circle

c)

along a tangent to the edge of the circle

d)

in a circle

100.

The mass at the end of a pendulum is made to move in a horizontal circle of radius r at constant speed. The magnitude of the net force on the mass is F.

What is the direction of F during half a revolution?

a)

towards the centre of the circle

b)

away from the centre of the circle

c)

along a tangent to the circle

d)

in a circle

101.

The mass at the end of a pendulum is made to move in a horizontal circle of radius r at constant speed. The magnitude of the net force on the mass is F.

What is the work done by F during half a revolution?

a)

0

b)

πrF

c)

(πrF)2

d)

2πrF

102.

An object of mass m at the end of a string of length r moves in a vertical circle at a constant angular speed ω.

What is the tension in the string when the object is at the bottom of the circle?

a)

m(ω2r + g)

b)

m(ω2r –g)

c)

mg(ω2r + 1)

d)

mg(ω2r +-1)

103.

An object of mass m moves in a horizontal circle of radius r with a constant speed v. What is the rate at which work is done by the centripetal force?

a)

mv3r\frac{mv^3}{r}

b)

mv32πr\frac{mv^3}{2\pi r}

c)

mv34πr\frac{mv^3}{4\pi r}

d)

zero

104.

An object rotates in a horizontal circle when acted on by a centripetal force F. What is the centripetal force acting on the object when the radius of the circle doubles and the kinetic energy of the object halves?

a)

F4\frac{F}{4}

b)

F2\frac{F}{2}

c)

FF

d)

2F2F

105.

The maximum speed with which a car can take a circular turn of radius R is v. The maximum speed with which the same car, under the same conditions, can take a circular turn of radius 2R is

a)

2v

b)

v√2

c)

4v

d)

2v√2

106.

A satellite X of mass m orbits the Earth with a period T. What will be the orbital period of satellite Y of mass 2m occupying the same orbit as X?

a)

T2\frac{T}{2}

b)

TT

c)

T2 T\sqrt{2\ }

d)

2T2T

107.

Two particles, X and Y, are attached to the surface of a horizontally mounted turntable.

The turntable rotates uniformly about a vertical axis. The magnitude of the linear velocity of X is v and the magnitude of its acceleration is a. Which of the following correctly compares the magnitude of the velocity of Y and the magnitude of the acceleration of Y with v and a respectively?

a)

Y velocity = v

Y acceleration < a

b)

Y velocity > v

Y acceleration < a

c)

Y velocity = v

Y acceleration > a

d)

Y velocity > v

Y acceleration > a

108.
Centripetal acceleration always points
a)
in the direction of the object's motion
b)
in the opposite direction of the object's motion
c)
towards the center of the circle
d)
towards the outside of the circle
109.
Bruno the bat flies at a speed of 0.5 m/s in circle of radius 1 m. What is his acceleration?
a)
0.25 ms-2
b)
0.5 ms-2
c)
1 ms-2
d)
2 ms-2
110.
Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s2.
a)
2.4 m/s
b)
3.6 m/s
c)
3.9 m/s
d)
4.2 m/s

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