1. Lecture 2.2: Speed, Velocity, Acceleration

2. Speed How fast or slow something moves.
Ex: Ms. McKinley’s Dodge Neon drives 70 mi/h down the 110 Fwy.
UNIT: distance unit divided by a time unit (ex: m/s, mi/h, km/h)

3. Velocity (Not the same as speed!)
Velocity is a VECTOR! (anything that has magnitude and direction)
It includes speed AND direction
An object’s velocity changes when:
The speed changes
The direction changes
BOTH speed AND direction change.
Example: Ms. McKinley’s Dodge Neon drives 70 mi/h NORTH on the freeway

4. Acceleration Change in VELOCITY Can happen in 3 ways: Speeding up
Slowing Down
Changing Direction

5. In Summary SPEED: change in POSITION over time
VELOCITY: change in POSITION over time, including DIRECTION
ACCELERATION: change in VELOCITY

6. Acceleration is the rate of change of ____. A velocity B speed C time
1.2 Speed, Velocity, and Acceleration
Acceleration is the rate of change of ____.
A velocity
B speed
C time
D direction A B C D
Lesson 2 Review

7. A car stopping at a red light is and example of a(n) ____.
1.2 Speed, Velocity, and Acceleration
A car stopping at a red light is and example of a(n) ____.
A displacement
B acceleration
C direction
D velocity A B C D
Lesson 2 Review

8. 1.2 Speed, Velocity, and Acceleration
It takes a runner 42.1 s to run a distance of 150 m. What is the runner’s average speed?
A 0.28 m/s
B 3.56 m/s
C 1.75 m/s
D 6.31 m/s A B C D
Lesson 2 Review