POSITION AND REFERENCE SYSTEMS
What do we call the object or point we use to decide if something is moving?
Reference point (or reference system).
What does “rectilinear” mean?
Answer: In a straight line.
What is speed?
the rate at which someone or something moves
In a position–time graph, what is on the horizontal axis?
One chance to answer. If wrong, spin the wheel.
Time.
A book is on a table. Is it moving?
Be careful
It depends on the reference point (relative to Earth no, relative to Sun yes).
A student is sitting in a moving bus. Is the student moving?
Be careful.
It depends on the reference point.
What does “uniform” mean in uniform motion?
Constant velocity (or constant speed).
What is the formula for velocity?
Bonus 100: What is the formula?
v = distance / time. v =d / t
In a position–time graph, what is on the vertical axis?
One chance to answer. If wrong, spin the wheel.
Position.
If you walk forward inside a moving train, are you moving faster than the train?
Be careful.
Relative to the ground, yes. Relative to the train, no.
What are the three main parts we must label in a graph?
Horizontal axis, vertical axis, and units.
In uniform rectilinear motion, does the object accelerate?
Bonus 100: “acceleration is ________.”
No. Acceleration is zero.
What unit do we use for velocity in the International System?
meters per second (m/s).
In uniform motion, what shape is the position–time graph?
a) a curved line to the right
b) a curved line to the left
c) a straight line
A straight line.
Spell the word “d / t” correctly.
velocity.
Spell the word n______ r_______.
If correct, the team may deduct 100 points from another team.
Nuclear reactor
If a car travels 20 meters every second, is its motion uniform? Why?
Yes, because it covers equal distances in equal times.
If a cyclist travels 100 m in 20 s, what is the velocity?
5 m/s.
If boxes is the plural of box, what is the plural of axis?
axes
If distance increases but velocity is constant, what type of motion is it?
Uniform rectilinear motion.
Double Jeopardy: Why can the same object be at rest and in motion at the same time?
If you get it wrong, you will lose double the points.
Because motion depends on the reference system.
Double Points: If velocity is constant, what happens to position over time?
It increases (or decreases) in a straight line at a constant rate.
Double points: If two objects move at the same speed, what does that mean?
They travel the same distance in the same time.
Double points: If the line in a position–time graph is horizontal, what is its velocity?
The object is at rest (velocity is zero).
A car moves 0 meters in 10 seconds. What is its velocity?
Add 200 points to their team or Remove 200 points from another team.
0 m/s.