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Circular Motion & Universal Gravitation

Total questions: 35

Worksheet time: 33mins

Name
Class
Date
1.

The Alpha Centauri system is the closest star system to Earth and contains two primary stars, Alpha Centauri A (1.1 x 1030 kg) and Alpha Centauri B (0.91 x 1030 kg), orbiting each other. The two stars are 3.5 x 1012 m apart. What are the gravitational forces between them?

a)

4.18 x 1022 N

b)

5.35 x 1024 N

c)

2.50 x 1019 N

d)

6.77 x 1021 N

2.

Jupiter is the largest plant at 1.9 x 1027 kg and has almost 100 moons. One of its largest moons is Io at 8.93 x1022 kg. The distance between Jupiter and it's moon is 4.217 x 108 m. What are the gravitational forces between them?

a)

2.93 x 1030 N

b)

1.13 x 1015 N

c)

5.5 x 1013 N

d)

6.4 x 1022 N

3.

Calculate the force of attraction between Jupiter and Saturn. Jupiter has a mass of 1.898 x 1027 kg and Saturn has a mass of 5.683 x 1026 kg. The approximate distance between them is 7.786 x 1011 m.

a)

1.187 x 1020

b)

9.876 x 1019 N

c)

2.345 x 1020 N

d)

3.786 x 1020 N

4.

Doubling the mass of an object...

a)

...will double the force of gravity.

b)

...will half the force of gravity.

c)

...will quadruple the force of gravity.

d)

...will quarter the force of gravity.

5.

Halving the distance between two objects...

a)

...will double the force of gravity.

b)

...will half the force of gravity.

c)

...will quadruple the force of gravity.

d)

...will quarter the force of gravity.

6.

Doubling the distance between two objects...

a)

...will double the force of gravity.

b)

...will half the force of gravity.

c)

...will quadruple the force of gravity.

d)

...will quarter the force of gravity.

7.

How is the gravitational force between to objects related to their distance (radius apart)

a)

They are directly proportional

b)

They are inversely proportional

c)

They do not affect each other

d)

They are equal

8.

How is the gravitational force between to objects related to their mass

a)

They are directly proportional

b)

They are inversely proportional

c)

They do not affect each other

d)

They are equal

9.

As the distance between objects increases...

a)

The smaller the force of gravity.

b)

The larger the force of gravity.

c)

Mass has no effect on the amount of gravity an object experiences.

10.

The larger the mass of an object...

a)

The smaller the force of gravity.

b)

The larger the force of gravity.

c)

Mass has no effect on the amount of gravity an object experiences.

11.
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
12.

The gravitational force between the two spheres is 40N.

Scenario: The distance between the two masses is then halved. What will the magnitude of the new force be when this happens.

a)

20 N

b)

40 N

c)

80 N

d)

160 N

13.

Find the distance between two objects whose masses are m1 = 4,500 kg, and m2 = 8,700 kg; if the gravitational force between them is F = 2.0 x 10-8 N.

a)

130565.25 m

b)

361.34 m

c)

0.19575 m

d)

0.783 m

14.
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
15.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
16.
Which represents the acceleration of the ball?
a)
A
b)
B
c)
C
d)
D
17.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
18.

moving or tending to move toward a center...

a)

centripetal force

b)

centrifugal force

c)

Tangent

d)

Curvature

19.
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
20.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
21.
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.
22.
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
23.

Suppose the speed of the car is 11.1 m/s (≈ 25 mph) and the radius of curvature (r) is 25 m; determine the magnitude of the centripetal force of the car if its mass is 1200kg.

a)

533 N

b)

5914 N

c)

6056 N

d)

12000 N

24.
Which of the following terms means "center seeking"?
a)
centrifugal
b)
centrifuge
c)
centripetal
d)
centenarian
25.
Calculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a velocity of 3 m/s if the ball weighs .12 kg and her arm is .65 meters long.
a)
.38
b)
1.23
c)
.55
d)
1.66 N
26.
Which of the following is the unit for centripetal force?
a)
J
b)
m/s2
c)
kg⋅m/s
d)
N
27.
Which of the following units is used for tangential velocity?
a)
m/s2
b)
N
c)
J
d)
m/s
28.

ω\omega

a)

tangential velocity

b)

centripetal acceleration

c)

period

d)

angular velocity

e)

walrus

29.

Units on Angular velocity

a)

rpm

b)

rad/sec

c)

rev/sec

d)

ms2\frac{m}{s^2}

30.

30 seconds for 6 spins. Period = ___________

a)

30 sec

b)

0.2 sec

c)

5 sec

d)

6 sec

31.

A rider on a Carousel is 2 meters from the center. The ride is spinning at 0.5 rad/sec. What is the tangential velocity of the ride?

a)

4 m/s

b)

1 m/s

c)

2 m/s

d)

0.5 m/s

32.

A dog sits 1.5 m from the center of a spinning merry-go-round. The magnitude of the velocity is 1.5 m/s.


What is the magnitude of the dog’s centripetal acceleration?

a)

3.9 m/s^2

b)

2.8 m/s^2

c)

1.5 m/s^2

d)

11.5 m/s^2

33.
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
34.

What is the tangential velocity if the centripetal force is 150 N when a 3 kg toy plane flies in a 2 m radius circle?

a)

10 m/s

b)

100 m/s

c)

225 m/s

d)

15 m/s

35.
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 were doubled?
a)
9
b)
18
c)
72
d)
144

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