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Practice Test for Unit 4: Uniform Circular Motion

Total questions: 31

Worksheet time: 30mins

Name
Class
Date
1.
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
2.
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
3.
A particle P is moving in a circle with uniform speed. Which one of the following diagrams correctly shows the direction of the acceleration a and velocity v of the particle at one instant of time?
a)
A
b)
B
c)
C
d)
D
4.
What is the direction of the velocity at point B, if the ball is revolving clockwise?
a)
up
b)
right
c)
down
d)
left
5.
What is the direction of the acceleration at point B, if the ball is revolving clockwise?
a)
up
b)
right
c)
down
d)
left
6.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
7.

Which statement is true about an object that is traveling in uniform circular motion?

a)

The speed of the object is constant.

b)

The net force on the object is directed toward the center of the circular path.

c)

The velocity of the object is constant.

d)

The net force on the object is directed away from the center of the circular path.

8.
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
9.
A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the friction force required to keep the car from sliding?
a)
9000 N
b)
9800 N
c)
300 N
d)
3000 N
10.
1.  You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it
a)
A)  moves along a straight-line path away from the center of the circle.
b)
A)  moves along a straight-line path toward the center of the circle.
c)
A)  moves along a straight-line path in its original direction.
d)
A)  continues to follow a circular path, but with a radius larger than the original radius.
11.
What is the Universal law of gravitation equation? 
a)
G=F ⋅ m⋅m2/r2
b)
F=G ⋅ m⋅m2/(r)2
c)
F=G ⋅ r2/m⋅m2
d)
G=F ⋅ r2/m⋅m2
12.
Two objects are attracted to each other with 36 N of gravitational force.
What would the force between them be if one of the masses were doubled?
a)
9
b)
18
c)
72
d)
144
13.

Two objects are attracted to each other with 36 N of gravitational force.

What would the force between them be if BOTH of the masses were doubled?

a)

9

b)

18

c)

72

d)

144

14.

Two objects are attracted to each other with 36 N of gravitational force.

What would the force between them be if the distance between them was doubled?

a)

9

b)

18

c)

72

d)

144

15.
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
16.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance 
b)
mass and matter
c)
distance and weight 
d)
weight and mass
17.
What states that "every object in the universe attracts every other object"?
a)
Law of Universal Gravitation
b)
Newton's First Law of Motion
c)
My mother
d)
Inertia & gravity
18.
Why do objects experience centripetal acceleration?
a)
Because they are speeding up as they move in a circle
b)
Because they are constantly changing direction and the 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.
19.

If the force of gravity has been reduced by a factor of 1/4 which could be true?

a)

Mass was increased 4 times

b)

Mass was decreased 2 times

c)

Distance was increased 4 times

d)

Distance was doubled

20.
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 momentum of an object in uniform circular motion.  
c)
The force that keeps the planets in orbit
21.
An object has a weight of 12N on the Earth.  It is placed on the moon, where gravity is (1/6) as strong as on the Earth.  What is its weight on the moon?
a)
2 N
b)
72 N
c)
6 N
d)
18 N
22.

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

23.

The drum of a washing machine rotates 1800 times in 3 minutes. What is the period?

a)

0.1 s

b)

0.2 s

c)

0.3 s

d)

0.5 s

24.

A toy car is following a circular path with a constant speed of v=3 m/s . If the radius of the circular path is 1 m, find The centripetal acceleration of the car

a)

30 m/s2

b)

3 m/s2

c)

9 m/s2

d)

6 m/s2

25.

what is the centripetal acceleration formula?

a)
b)
c)
d)
26.

What is the velocity formula for uniform circular motion?

a)
b)
c)
d)
27.
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
28.
Which of the following is the unit for centripetal force?
a)
J
b)
m/s2
c)
kg⋅m/s
d)
N
29.

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)
30.
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
31.
The time taken for one complete circuit is called the... 
a)
Period
b)
Frequency 
c)
Angular velocity

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