1. Motion Notes Speed, Velocity, and Acceleration!

2. Motion
A change in position, over time, relative to a reference point.

3. So, What’s a Reference Point?
What we compare all other movement or locations to!
Often Earth Features
Large Objects
Cities

4. Reference Point Scenarios
Suppose you are in a train, and you cannot tell if you are stopped or moving. Outside the window, another train is slowly moving forward. What could be happening?
Your train is stopped, and the other train is moving slowly forward…
The other train is stopped, and your train is moving slowly backwards…
Both trains are moving forward, with the other train moving a little faster…
Your train is moving very slowly backward, and the other train is moving slowly forward…
Could you be sure as to which is actually happening??

5. Reference Point Examples

7. Speed Position can change at different rates
Distance an object moves in an amount of time
Formulas
Speed=Distance/Time
Distance=Speed x Time
Time= Distance/speed

8. Velocity
Suppose there’s a TORNADO that’s 1 mile wide, and it’s going 40 mph…
What else is important?!?!?
It’s Direction!
Velocity is a Speed in a Direction!
15 Mph Northwest; 200 m/s South;
40 cm/ms Left

9. Acceleration Change in Velocity over time
Remember: Velocity is Speed AND Direction
“Speeding Up” = Acceleration (Positive #)
“Slowing Down” = Deceleration (Negative #)
Turning (Change in Direction) = Acceleration

10. Which of the Following Are Examples of Acceleration?
A car stops at a stop light.
A car goes from 0 to 45 mph.
A car races around an oval track at a constant speed.

11. Final Velocity – Initial Velocity
Acceleration Formula
THIS IS TOUGH!!!
Final Velocity – Initial Velocity
Time
Vfinal– Vinitial T

12. Final Velocity – Initial Velocity
Acceleration Problem!
Julio starts sliding with a velocity of 1m/s south. After 3 seconds, his velocity is 7m/s south. What is Julio’s acceleration?
Final Velocity – Initial Velocity
Time
7 m/s – 1 m/s 3s
6 m/s
2 m/s s
2 m/s2

13. Practice! Final Velocity – Initial Velocity Time Review:
Speed/Distance/Time Formulas:
S=D÷T D=T·S T=D÷S
Acceleration Formula:
Final Velocity – Initial Velocity
Time

14. How far could this runner run in 25 seconds?
Practice
If a runner runs 100 meters in 50 seconds, what is his speed in meters per second?
How far could this runner run in 25 seconds?

15. Calculating Acceleration
John starts running from rest. After 10 s, his velocity is 20 m/s. What is John’s rate of acceleration?