1. Chapter 9 Section 2: Speed and Velocity
Key terms: speed, average speed, instantaneous speed, velocity, slope
Key concepts: How do you know an object’s speed and velocity? How can you graph motion?

2. Calculating speed
If you know the distance an object travels in a certain amount of time, you can calculate the speed of the object.
Speed = distance/time
It needs a unit, usually meters/second or km/hr

3. Average speed
Total distance/total time = average speed
Confusing?

4. Imagine a cyclist
Imagine a cyclist travels 32 km for 2 hours. Then he travels 13 km for 1 hr. What is his average speed?

5. First Total distance? 32 km for 2 hrs and 13 km for 1 hr 32+13= 45 km
Total time? 2+1= 3 hrs
Total distance/total time= average speed
45km/3 hrs= 15 km/hr

6. Instantaneous speed
The rate at which an object is moving at a given instant in time

7. Velocity
Fun fact: sloths (seen right) often mistake their own arms for tree branches and fall to their deaths by trying to grab onto themselves

8. Describing velocity
When you know the speed and the direction an object is moving, you can calculate velocity.
Take note, velocity MUST include a direction.
Velocity: speed in a given direction
Why is this important? Air traffic control, trains, storm tracking, etc

9. Graphing motion
You can show the motion of an object on a line graph in which you plot distance versus time.
Time is on the x-axis, distance on the y-axis
The steepness of the line is the slope
Slope = rise/run

10. OMG NOW WHAT, MS. FUENTES?
Now: work on the assessments for these two sections, compare your notes to your book. Read, students, absorb knowledge into your brains and regurgitate it back into your notes in the form of assessment-answers.
THEN: STUDY FOR YOUR SOCIAL STUDIES EXAM. NOW. IN CLASS. OR STUDY FOR SCIENCE.
OR: ASK ME FOR HELP WITH YOUR RESEARCH PAPER AND/OR EXPERIMENT
OR: SET UP YOUR NOTES FOR THE REST OF THE CHAPTER
YOU do not have time for time-wasting. You are important and need to educate yourselves while you are young so you can save us from impending country-wide disasters with your super-educated brains.