1. PHYSICS Describing Motion Speed and Velocity Acceleration

2. FRAME OF REFERENCE  Frame of Reference/ Reference Point: a place or an object used to determine if something is moving. If the position of something is changing relative to your chosen reference point, it is said to be moving.  Motion: An object is in motion if its distance from or position compared to another object is changing.

3. FRAME OF REFERENCE

6. DISTANCE V. DISPLACEMENT  Distance: Length of a path traveled between two points.  Displacement: Length and direction of the distance an object has moved from its starting point.  Vector: A quantity that consists of both a magnitude (size) and direction. Displacement is a vector.

7. SPEED  Read page 342. Copy these questions and answer them on Jp7  1. What does a measurement of distance tell you about a moving object?  2. If you know the distance something traveled and the time it took to travel that distance, what can you calculate about the motion?  3. What is meant by “rate”?  4. Tell how you actually calculate speed. How do you do the math?  5. Give two example from the book of units you would use to describe speed.  6. Give two examples not from the book (centimeters per day cm/day).

8.  d = distance  s = speed (or rate)  t = time (leave room on this page for more) SPEED PROBLEMS

10. SPEED GRAPH (stopped)

11. SPEED QUESTIONS #1-6 (Leave a narrow, blank margin) 1. Speed is a rate, speed shows … (Skip lines between items!) 2. The y-axis is always… 3. Distance on the graph means distance the object traveled from… 4. What is slope? 5. How do you calculate slope? (explain the math) 6. What does a steep slope mean?

12. SPEED GRAPH  Velocity – Speed and direction of travel. Velocity is a vector.  Velocity changes if speed changes.  Velocity changes if direction changes.

13. ACCELERATION 1. In everyday language, acceleration means… 2. In science, acceleration specifically describes a change in … 3. The three ways an object can accelerate are… 4. “Negative acceleration” means… 5. Even if something does not speed up or slow down, it can accelerate by…

14. ACCELERATION Acceleration = initial velocity – final velocity time Units for acceleration are m/s/s OR m/s 2

15. ACCELERATION 1. Another way to say “final velocity” is… 2. Another way to say “initial velocity” is… 3. If you subtract initial velocity FROM final velocity you are finding… 4. If you take the amount that velocity changed and you divide that by how long it took to change, you are finding … 5. Write the formula for finding acceleration. 6. The units for acceleration are…

16. 1.What is shown on the x-axis? 2.What is shown on the y-axis? 3.What is this graph showing you? 4.Is the slope of the line constant? 5.What does that tell you?

17. 6.Can you tell when the object is moving faster and when it is moving slower? 7.If the object was moving at a constant speed, how would the line be different?

18. 8.What is on the x-axis? 9.What is on the y-axis? 10.How is this graph different from the one on the previous slide? 11.What is this graph showing you? 12.What is the slope of this graph? 13.What are the units for the slope?