TEST 1 Q2
PHYSICS

CHAPTER 3 Relative
Motion, Vectors, 2-dimensional (projectile) motion

Relative
motion:

Explain
the concepts of

Reference
frames

Relative
velocity

Special
relativity

Sketch
the path of a ball thrown on a moving train from the point of view of the
train, the ball, an observer on the ground, an observer on another train… both
for a normal train and one moving close to the speed of light.

How
to find the velocity of one object with respect to another if you know the
velocity of each with respect to the ground…

Vectors:

Relative
motion with 2 dimensions instead of one.

What
is a vector?

How to add
vectors to find the resultant (head to tail: graphical method, right triangles…
(law of sines??) ).

What
properties are vectors? And which are scalars?

How
and why there are 6 ways to add three vectors.

How
to find the angle of the resultant.

How
to find the x/y, horizontal/vertical, north/east, components of a vector at an
angle.

Projectile
motion:

Why
and how do we separate motion into x/y perpendicular components?

What
is projectile motion?

What
is the path of a projectile and how does this explain why you CAN’T make a
vector of displacements in projectile motion?

What
property is the same in the x and y direction for projectile motion?

What
is the angle of maximum range for a projectile and why?

What
information do you know about a projectile while it is at the top of its arc?

What
information do you know about a projectile fired horizontally?

What
information do you know about a projectile fired from the ground that lands on
the ground?

Draw
a strobe diagram of the vertical and horizontal components of a projectile’s
motion.

What
formula is always used in the x direction and why?

What
formulas are usually used in the y direction?

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Why can you never answer “how fast are you going”?

A passenger on a train going east is skateboarding towards
the back, while throwing a spear towards the front, while there is an ant
walking towards the point of the spear.

Describe the path of the spear as seen from the: passenger,
ground, ant, train.

How would you calculate the velocity of the ant?

A piece of chalk is dropped by a teacher walking at
a speed of 1.5 m/s. From the teacher's perspective how does the chalk appears
to fall? How does it fall from the ground’s point of view?

Why are there two answers to the question: How
far did you travel?

Two vectors acting at right angles to each
other having the magnitude 6 and 8 have a resultant with a magnitude of

What are quantities that are given as scalar or
vectors? What does a vector mean?

How would parabolic motion be different at speeds
close to the speed of light?

Describe the two ideas (postulates) that lead to the
theory of special relativity:

What are the consequences of special relativity?
(How do the properties we know change at speeds close to the speed of light?)

A small airplane flies at a velocity of 145
km/h toward the south as observed by a person

on the ground. The airplane pilot measures an
air velocity of 170.0 km/h south. What is

the velocity of the
wind that affects the plane?

While following directions on a treasure map, a person
walks 75.0 m south, then turns and walks 4.50 m east. Which single straight‑line displacement could the
treasure hunter have walked to reach the same spot?

A boat crosses a 30 meter wide river with an initial
speed of 20 m/s aimed straight across (perpendicular to the current). If the
current is 5 m/s, where and when will the boat reach the other side?

If a plane is pointed due east, but the path it
takes from the ground is due south, the wind must be blowing

If I take a journey and walk three different legs to
my journey, describe how to calculate the total displacement.

What are the conditions necessary for projectile
motion? Describe the change in vertical and horizontal velocity

What does a strobe diagram seen from above
(projected horizontally) look like for an object that is thrown in the air?

What does a strobe diagram seen from head on
(projected vertically) look like for an object that is thrown in the air?

An arrow is shot in the air with a velocity of
61 meters per second at an angle of 20 degrees. How high will the arrow go?

__ __

A stone is thrown at an angle of 30.0° above the
horizontal from the top edge of a cliff with an initial speed of 12 m/s. A
stopwatch measures the stone's trajectory time from the top of the cliff to the
bottom at 5.6 s. What is the height of the cliff?

A model rocket flies horizontally off the edge of
the cliff at a velocity of 50.0 m/s. If the

canyon
below is 100.0 m deep, how far from the edge of the cliff does the model rocket

land?

Where would a baseball pitcher have to aim a
fastball to have it pass at the height of a batter's chest? Why?

In projectile motion, the rising and falling
times are equal if the landing position is related how to the launching
position?

A firefighter 60 meter away from a burning
building directs a stream of water from a fire hose at an angle of 30 degrees
above the horizontal. If the velocity of the stream is 20 m/s, at what height
will the stream of water strike the building?(on earth with no air resistance)

** Honors: at what angle should you hold the
hose in order to hit the building level with you?

** Honors: Calculate the journey of a man who
walks 50 miles at 76 degrees west of south, then 40 miles at 65 degrees north
of east for 3 hours in each leg. What is the velocity of a plane that wants to
catch him exactly, that is being blown by a 12 mph north wind?