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WorksheetsGravity and Black holes
Total questions: 20
Worksheet time: 23mins
Name
Class
Date
1.
Black holes are formed when stars lose gas to burn, form a red super giant, cool down, then become so dense...
a)
the star flattens like a pancake.
b)
the matter of the star collapses on itself.
c)
the star turns into a giant ice ball.
d)
the star explodes.
2.
Radiation in the center/core of a star pushes outward while ____________
pushes down on a star.
pushes down on a star.
a)
gravity
b)
the Earth
c)
atmosphere
d)
dark matter
3.
Can light escape a black hole?
a)
yes
b)
no
4.
Scientists theorize that a _____________________________ is at the center of every galaxy.
a)
stellar black hole
b)
cosmic black hole
c)
super massive black hole
d)
star
5.
When Our Sun Dies It Will Make a Black Hole
a)
True
b)
False
6.
What is the edge of a black hole called?
a)
The Ring
b)
The Verge
c)
The Outside
d)
The Event Horizon
7.
Black holes obey the laws of gravity.
a)
True
b)
False
8.
What is a black hole?
a)
A wormhole that leads to another galaxy.
b)
An object with such a strong gravitational pull nothing can escape it.
c)
A rip in time.
d)
The end of the universe.
9.
The "helium flash" occurs at what stage in stellar evolution?
a)
horizontal branch
b)
planetary nebula
c)
in the middle of the main sequence stage
d)
as the T Tauri bipolar jets shoot out
e)
red giant
10.
A method for identifying a black hole is to:
a)
search for radio waves from the accretion disk.
b)
look for their effects on nearby companions.
c)
locate a visible star that disappears when the black hole passes in front of it.
d)
look for voids in the star fields.
e)
search for their pulsar signal.
11.
How does time change in a black hole?
a)
Black holes are so massive that they severely warp the fabric of spacetime (the three spatial dimensions and time combined in a four-dimensional continuum). ... The light will appear to continually slow down as it approaches the black hole, ultimately reaching a complete dead stop at the event horizon.
b)
It changes when you go inside it
c)
It dosent affect time
d)
None of the above
12.
Which of the following is Newton's Law on Gravitation?
a)
F=Gm1m2/r
b)
F = Gm1m2/r2
c)
F = Gm1m2/2r
d)
F = m1m2/2r
13.
The moon and other satellites rotate around the earth. Identify the force that keeps these satellites in orbit.
a)
gravity
b)
friction
c)
a strong force
d)
electromagnetic force
14.
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
15.
Force of gravity is inversely proportional to
a)
Mass
b)
Weight
c)
Distance
d)
Time
16.
If I double the distance between two objects, what happens to their gravitational Force?
a)
4x bigger
b)
4x smaller
c)
2x bigger
d)
2x smaller
17.
What happens to Gravitational force if I double both of the masses but don't change their distance?
a)
doubles
b)
half as big
c)
4x bigger
d)
4x smaller
18.
Gravity is the force objects put on each other because of their ______.
a)
Mass
b)
Friendliness
c)
Acceleration
d)
Speed
19.
The amount of matter in an object
a)
mass
b)
weight
c)
inertia
d)
gravity
20.
Luke Skywalker has a mass of 13 kg and weight of 127.4 N on earth. Find his weight on the Endor moon. Acceleration due to gravity of 2 m/s/s.
a)
254.8 N
b)
13 kg
c)
26 N
d)
127.4 kg
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