Vocabulary
A point of comparison that allows us to detect motion
Frame of reference
0.47s is a measure of
time
I traveled 50km in 1hr. What is my speed?
50km/1hr = 50km/hr
I'm standing on a truck bed bouncing a basketball.
The truck is moving 20mph.
Why am I able to bounce the basketball without it flying away?
Everything is moving at the same velocity.
The length of an object’s path from a starting point
Distance
0.74 m/s is a measure of
speed
I traveled 100km in 0.5hr. What is my average speed?
100km/0.5hr =200km/hr
This is the greatest bike race in the world.
The Tour de France.
A measurement that includes both magnitude and direction
Vector
1.83m/s to the west is a measure of
Velocity
A ball falls down with a velocity of 9.0m/s.
How far did it fall after 2s?
9.0m/s * 2s = 18m
I'm standing on a truck bed bouncing a basketball.
The truck is moving 20mph.
I throw the basket ball forward with a speed of 5mph.
What is the velocity of the basketball?
25mph in the forward direction
A measurement that only includes the magnitude or size of something
Scalar
183cm is a measure of
Distance
I can accelerate at a rate of 2m/s2
If I accelerate for 4s what will my final speed be?
2m/s2 * 4s = 8m/s
I'm standing on a truck bed bouncing a basketball.
The truck is moving 20mph.
I throw the basketball backwards with a speed of 5mph.
What is the velocity of the basketball?
15mph in the forward direction
How far something travels in a given amount of time
32.1 ft/s2 is a measure of
Acceleration
A falling ball increases its velocity from 9m/s to 19m/s in 1s.
What is the ball's rate of acceleration?
(19m/s - 9m/s) / 1s = 10m/s2
An airplane called the "vomit rocket" is used to create a "weightless" environment. It does this by flying upward then by flying downward at steep angles causing the passengers to float out of their seats.
Explain this using the term "frame of reference".
The plane and passengers are all "falling" at the same rate if viewed from the ground. From the passengers "frame of reference" they are floating compared to the plane.