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Scientific Notation, Gravity, and Circular Motion Review

Total questions: 25

Worksheet time: 1hrs 13mins

Name
Class
Date
1.

How does the gravitational force the Earth exerts on the sun compare to the gravitational force the sun exerts on the Earth?

a)

The gravitational force the sun exerts on the Earth is larger

b)

The gravitational force the Earth exerts on the sun is larger

c)

Their gravitational forces are equal

d)

There is not enough information

2.

As two objects get closer together, what happens to the force of gravity between them?

a)

The force of gravity increases

b)

The force of gravity decreases

c)

The force of gravity stays the same, since their masses are constant

d)

Not enough information

3.

How does the force of gravity between two objects change when the mass of one of the objects increases?

a)

Fg increases

b)

Fg decreases

c)

It depends on the distance between the objects

d)

Fg stays the same

4.

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

5.
7.82 x 10-6 is an example of scientific notation. The exponent of -6 tells you your number will be very ________.
a)
Large
b)
Small
c)
Basic
6.
Change from standard form to scientific notation: 12,000,000
a)
12.0  x  107
b)
0.12  x  107
c)
1.2  x  106
d)
1.2  x  107
7.
Change from standard form to scientific notation:  450,000
a)
4.5  x  105
b)
45  x  105
c)
4.5  x  104
d)
4.5  x  106
8.
Change from standard form to scientific notation:  0.000398
a)
39.8  x  10-5
b)
3.98  x  10-5
c)
3.98  x  10-4
d)
39.8  x  10-6
9.
Try to change the number back to standard form:  6.79  x  104
a)
679,000
b)
6,790
c)
67,900
d)
6,790,000
10.
What is the SI unit used to measure force? 
a)
pounds 
b)
grams 
c)
newtons 
d)
kg/ m2
11.

Calculate the gravitational force between two objects when they are 0.750m apart. Each object has a mass of 5.00kg.

a)

2.96x10-7N

b)

3.00x10-6N

c)

2.22x10-9N

d)

2.23x10-8N

12.
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
13.

What is the gravitational force between two identical 50,000 kg asteroids whose centers of mass are separated by 1000 m?

a)

2500 N

b)

3.3 x 10-12 N

c)

1.67 x 10-4 N

d)

1.67 x 10-7 N

14.
Complete the following statement: The farther away two planets are the _______ the gravitational force between them.
a)
more
b)
same
c)
dosen't matter
d)
less
15.
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
16.
What is the direction of the velocity at point B, if the ball is revolving clockwise?
a)
up
b)
right
c)
down
d)
left
17.
What is the direction of the acceleration at point A, if the ball is revolving clockwise?
a)
up
b)
right
c)
down
d)
left
18.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
19.
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.
20.
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
21.

If I double the mass of one object, but don't change anything else... What happens to the gravitational force between two objects?

a)

Doubles

b)

Quadruples

c)

Cut in Half

d)

4x Smaller

22.

The number 6.67 x 10 -11 N* m2 / kg2 is called the

a)

Universal speed constant

b)

centripetal force

c)

Universal Gravitational constant

d)

Earth's Gravitational constant

23.

Two masses m1 and m2 are separated by a distance R and gravitational force between them is F. If the distance R is doubled the force will now be _

a)

4

b)

2

c)

1/2

d)

8

e)

1/4

24.

Two masses m1 and m2 are separated by a distance R and gravitational force between them is 1. If the distance R is reduced to 1/2 the force will now be

a)

8

b)

2

c)

1/4

d)

1/2

e)

4

25.

Astronauts in orbit around the Earth appear weightless because

a)

the Moon's gravity cancels out the Earth's gravity

b)

they are above the atmosphere

c)

they are far enough from the Earth where gravity does not affect them

d)

they are falling

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