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Gravitation. Kepler & Circular Motion

Total questions: 30

Worksheet time: 30mins

Name
Class
Date
1.
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
2.

A person on the Earth weighs 180 pounds. How much will they weigh on the moon? ( Note: The moons "g" is1/6 that of Earth)

a)

30 lbs

b)

360 lbs

c)

0- you are weightless in space

d)

18 lbs

3.
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
4.
Where is the planet moving faster
a)
Position A to B
b)
Position B to C
c)
Position H to I
d)
Position I to J
5.
Planets orbit the Sun in a shape called a(n)
a)
circle
b)
ellipse
c)
focus
d)
perihelion
6.
What is true about the area between points A, B and the Sun, and the area between points H, I and the Sun?
a)
The area between A, B and the Sun is the largest.
b)
The area between H, I and the Sun is the largest
c)
Both areas are equal in size
d)
There is not enough information to determine the areas
7.
Two asteroids exert a gravitational force, F, on each other. Some time later, the asteroids are now three times as far from each other as before. Which of the following represents the gravitational force at this distance? 
a)
F/3
b)
F/2
c)
F/6
d)
F/9
8.
Which is larger, the Sun's pull on the Earth or Earth's pull on the Sun? 
a)
THe Sun's pull on the Earth is larger.
b)
THe Earth's pull on the Sun is larger
c)
They pull on each other equally
d)
The Sun's pull on the Earth is twice as large as Earth's pull on the Sun.
9.

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

10.
Which planet would have the longest year?
a)
Mercury
b)
Mars
c)
Jupiter
d)
Neptune
11.
Which graph models the relationship between gravity and mass?
a)
Graph A
b)
Graph B
c)
Graph C
d)
Graph D
12.
What is the direction of the velocity at point B, if the ball is revolving clockwise?
a)
up
b)
right
c)
down
d)
left
13.
The velocity is always _____ to the line of a circle. 
a)
outwards
b)
towards the center
c)
tangent
d)
faster
14.
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.
15.
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
16.

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 an object resisting change

c)

The force that keeps the planets in orbit

17.
What is the SI unit for radius?
a)
meter
b)
pi
c)
inches
d)
kilometer
18.
Period is measured in cycles per second
a)
True
b)
False
19.
Which of the following terms means "center seeking"?
a)
centrifugal
b)
centrifuge
c)
centripetal
d)
centenarian
20.
Which of the following is the unit for centripetal force?
a)
J
b)
m/s2
c)
kg⋅m/s
d)
N
21.
Which represents the acceleration of the ball?
a)
A
b)
B
c)
C
d)
D
22.
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
23.
What is required in order for an object to move in a circle?
a)
An outward directed unbalanced force
b)
Any force acting inward toward the center of the circle
c)
An unbalanced force acting inward toward the center of the circle.
d)
Both an inward and an outward force.
24.
At any given moment in time, the force of centripetal acceleration is
_____________ to the instantaneous velocity vector of an object.
a)
Parallel
b)
Perpendicular
c)
Opposite
d)
Varies Based On The Circumstances
25.
Which of the following depict the speed of the blowing ball?
a)
A
b)
B
c)
C
d)
D
26.
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.
27.
What is the SI unit for circumference?
a)
meter
b)
pi
c)
inches
d)
kilometer
28.

Why does mud fly off a car tire rapidly spinning?

a)

The mud is electrically charged

b)

There is no longer a centripetal force keeping the mud in circular motion

c)

The gravitational attraction of the moon pulls the mud off

29.

If the disk is increasing the rate at which it spins, which lady bug will fly off first?

a)

Lady Bug 1

b)

Lady Bug 2

c)

Same time!

30.

Why do scientists think that there are these extremely large masses at the center of a galaxy aka Black holes?

a)

All celestial objects in the galaxy revolve around a center point and must are captured by a centripetal force which must stem from a gravitational attraction between two masses

b)

Umm well why not?

c)

The unicorns told us!

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