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Intro to Relativity

Total questions: 20

Worksheet time: 12mins

Name
Class
Date
1.
A train slowing down as it climbs a hill is an example of an inertial frame of of reference.
a)
True
b)
False
2.
A train stopped at a station is an inertial frame of reference.
a)
True
b)
False
3.
A train moving with a constant speed is an example of an inertial frame of reference.
a)
True
b)
False
4.
When you approach a light source, the light from that source has a speed 
a)
greater than c. 
b)
less than c. 
c)
equal to c.
5.
The Michelson–Morley experiment established that
a)
there is no observable æther wind at the surface of Earth.
b)
the æther moves at the speed of light, c, as Earth travels in its orbit.
c)
the æther is an elastic fluid that streams over Earth.
d)
Earth does not move with respect to the Sun.
e)
none of these
6.
Which of the following statements about special relativity is FALSE?
a)
An assumption of special relativity is that the laws of physics are the same in all inertial reference frames.
b)
An assumption of special relativity is that the speed of light is the same in all reference frames.
c)
An assumption of special relativity is that space and time are part of the same thing: spacetime.
d)
An assumption of special relativity is that the laws of the physics are the same in all ‘constant velocity’ reference frames.
7.
What two principles make up the theory of special relativity?
a)
The principle of nuclear forces and the invariance of the speed of light.
b)
The constancy of physical laws and the principle of mass-energy conservation.
c)
The principle of mass-energy conservation and the principle of nuclear forces.
d)
The constancy of physical laws and the invariance of the speed of light.
8.
The laws of Physics change with your point of view.
a)
True
b)
False
9.
We do not usually observe relativistic effects in our daily lives because 
a)
we are moving at speeds much less than c. 
b)
we are much larger than atoms. 
c)
we are much heavier than elementary particles. 
d)
we are much lighter than stars. 
10.

What astronomer was the firs to nail down a concrete measure of the speed of light?

a)

Newton

b)

Galileo

c)

Romer

d)

Plato

11.

Regardless of how Michelson and Morley oriented their device relative to Earth's motion, they measured no time difference. The beams always recombined in such a way that no interference pattern was produced.


Which of the following could produce this result?

a)

To an observer moving relative to the interferometer, the arms have two different lengths.

b)

Earth's speed relative to the aether is very close to c

12.

Which worldline shown represents and object moving faster then the other?

a)

Red

b)

Blue

c)

Not enough info!

13.

Which worldline shown is impossible? Check all that apply.

a)

Red

b)

Blue

c)

Green

d)

Purple

14.

True or False? In Galilean Relativity, observers moving relative to one another will measure spatial positions differently.

a)

True

b)

False

15.

True or False? In Galilean Relativity, observers moving relative to one another will measure time intervals differently.

a)

True

b)

False

16.

True or False? In Galilean Relativity, observers moving relative to one another will measure the speed of light differently.

a)

True

b)

False

17.

What was the historical takeaway from the Michelson & Morley experiment?

a)

It demonstrated there was no luminiferous aether.

b)

It demonstrated light must move at the same speed regardless of reference frame.

c)

It demonstrated light was a wave phenomena.

d)

It demonstrated that the speed of light was relative.

18.

On spacetime diagrams, the worldline for light is always at _____.

a)

a 45 degree angle

b)

a 90 degree angle

c)

a 0 degree angle (i.e. flat/horizontal)

19.

What is your position in your own reference frame?

a)

x=ctx=ct

b)

x=vtx=vt

c)

x=0x=0

d)

x=cvtx=\frac{cv}{t}

20.

In a spacetime diagram, suppose you have a worldline for some object moving relative to your frame of reference. If the object were moving twice as fast, what would happen to its worldline?

a)

It'd have a slope twice as large as before.

b)

It's have the same slope as before.

c)

It'd have a slope half as much as before.

d)

It'd have no slope and be a flat worldline.

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