Motion is Relative Motion is only measured relative to another object, called the reference point.
Usually, we use the _____________ as our reference point.
Are you moving right now?
If the sun is your reference point, YES!

Rates :

Rates A rate describes how fast something happens or changes over time.
Any quantity divided by time is a rate.
We will study three different rates in this unit: speed, velocity, and acceleration.

Speed :

Speed Chelsea walked 2 miles in 30 minutes and Casey walked 1 mile in 30 minutes. Who had the greater speed?
So greater distance implies greater speed
Speed and distance are directly proportional: if one increases…

Slide 5:

Speed Chris walked 2 miles in 30 minutes and Corey walked 2 miles in 10 minutes. Who had the greater speed?
So less time implies greater speed
Speed and time are indirectly (or inversely) proportional: if one increases…

Speed :

Speed A measure of how fast something is moving
Depends on two quantities:
distance
time

Speed :

Speed Recall: speed is a rate, so it must be…
Divided by time!
The formula/equation for speed is:
speed = distance
time
OR
s = d
t

Speed Units :

Speed Units The units used to measure speed are meters per second, or m/s.
Why?
speed = distance
time
= [meters]
[seconds]

Instantaneous Speed & Average Speed :

Instantaneous Speed & Average Speed Do all objects stay at the same speed?
No! An object’s speed at any given instant in time is called its instantaneous speed.
An object’s average speed is an average (usual/standard) of how fast the object traveled over a certain amount of time.

Velocity :

Velocity Velocity is a speed in a given direction.
These planes might all have the same speed, but they all have different velocities because they are going in different directions.
Identify the following as a time, distance, speed, or velocity:
1000 m
1000 m/s
1000 m/s to the North
1000 s

Velocity :

Velocity To have a constant (unchanging) velocity then, you must have constant
Speed
And direction
Which of the following have constant velocity?

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