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Circular Motion and Gravity

Total questions: 15

Worksheet time: 42mins

Name
Class
Date
1.

A 12 kg object undergoes circular motion with a radius of 4 m and a speed of 18 m/s. What is the centripetal acceleration of the object?

a)

1.125 m/s2

b)

81 m/s2

c)

4.5 m/s2

d)

36 m/s2

2.

The diagram shows an object traveling at a constant speed in a circular path. Which labeled arrow represents the centripetal force acting on the object?

a)

W

b)

Z

c)

X

d)

Y

3.
A ball on a string is travelling in circular motion. Which vector represents the centripetal force?
a)
The green vector because it points towards the center of the circular path
b)
The blue vector because it shows the direction of the object's inertia
c)
The green vector because it shows the path of the ball
d)
The blue vector because this is the way the ball will move when it is released.
4.
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
5.
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
6.
Which represents the acceleration of the ball?
a)
A
b)
B
c)
C
d)
D
7.

What is the direction of the velocity at point B, if the ball is revolving clockwise?

a)

up

b)

right

c)

down

d)

left

8.

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

9.
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
10.
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 divided by 2?
a)
9
b)
18
c)
72
d)
144
11.
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
12.
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
13.

What's the acceleration of gravity of a planet with a mass of 1 x 1025 kg and a radius of 5x106 meters?

a)

.267 m/s2

b)

2.67 m/s2

c)

26.7 m/s2

d)

267 m/s2

14.

Two object each have masses of 9,000,000 kg and are 1 meter apart from each other. What's the force of gravity between them?

a)

5402 N

b)

6320 N

c)

7541 N

d)

7945 N

15.

Two objects each have masses of 4500 kg and are .03 meters apart from each other. What's their force of gravity?

a)

.3 N

b)

.7 N

c)

1.1 N

d)

1.5 N