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# 8.1 Motion

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### 8.1 Motion

1. 1. 8.1 Motion Pages 252-258
2. 2. Goal 1 Understand the relationship between speed , distance , and time ; also solve speed equations.
3. 3. <ul><li>Speed </li></ul><ul><ul><li>Distance traveled in a certain amount of time </li></ul></ul>
4. 4. <ul><li>Constant speed </li></ul><ul><ul><li>Distance covered per unit time remains the same </li></ul></ul>
5. 5. <ul><li>Speed Graph </li></ul><ul><ul><li>Y-axis distance </li></ul></ul><ul><ul><li>X-axis time </li></ul></ul><ul><ul><li>Faster  Steeper slope </li></ul></ul><ul><ul><li>Slower  flatter slope </li></ul></ul>
6. 6. <ul><li>Speed equation (aka velocity equation) </li></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><li>Speed = distance </li></ul><ul><li>time </li></ul><ul><li>v = d </li></ul><ul><li>t </li></ul>
7. 7. <ul><li>Example </li></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><ul><li>Find Ms. Acker’s speed if she traveled 10 meters in 20 seconds on her skateboard. </li></ul></ul><ul><ul><li>d = </li></ul></ul><ul><ul><li>t = </li></ul></ul><ul><ul><li>v = </li></ul></ul>
8. 8. <ul><li>Speed equation (aka velocity equation) </li></ul><ul><ul><li>To find distance </li></ul></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><li>Distance = speed x time </li></ul><ul><li>d = v x t </li></ul>
9. 9. <ul><li>Example </li></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><ul><li>How far did the ping pong ball travel if it rolled across the table at a speed of 2 meters per second for 0.5 seconds? </li></ul></ul><ul><ul><li>d = </li></ul></ul><ul><ul><li>v = </li></ul></ul><ul><ul><li>t = </li></ul></ul>
10. 10. <ul><li>Speed equation (aka velocity equation) </li></ul><ul><ul><li>To find time </li></ul></ul><ul><ul><li>Remember your units </li></ul></ul><ul><li>time = distance </li></ul><ul><li>speed </li></ul><ul><li>t = d </li></ul><ul><li>v </li></ul>
11. 11. <ul><li>Example… </li></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><ul><li>How long will it take for a bowling ball to travel 10 meters if it is rolling at a speed of 7 meters per second? </li></ul></ul><ul><ul><li>t = </li></ul></ul><ul><ul><li>d = </li></ul></ul><ul><ul><li>v = </li></ul></ul>
12. 12. Goal 2 Distinguish between speed and velocity
13. 13. <ul><li>Speed is distance per time </li></ul><ul><li>Velocity is distance per time in a direction </li></ul>
14. 14. <ul><li>Velocity or Speed? </li></ul><ul><li>A lion ran at 12 m/s. </li></ul>
15. 15. <ul><li>Velocity or Speed? </li></ul><ul><li>A lion ran at 12 m/s towards the gate. </li></ul>
16. 16. <ul><li>Velocity or Speed? </li></ul><ul><li>A science 9 student walked 4 miles/hour. </li></ul>
17. 17. <ul><li>Velocity or Speed? </li></ul><ul><li>A science 9 student walked 4 miles/hour towards the ala carte line. </li></ul>
18. 18. Goal 3 Understand momentum and use the momentum equation .
19. 19. <ul><li>Momentum </li></ul><ul><ul><li>An object’s mass times it’s velocity </li></ul></ul>
20. 20. <ul><li>Momentum equation </li></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><li>Momentum = mass x velocity </li></ul><ul><li>p = m x v </li></ul>
21. 21. <ul><li>Example… </li></ul><ul><ul><li>Remember your units </li></ul></ul><ul><ul><li>What is the momentum of a 13 g swallow* traveling with a velocity of 10 m/s to Europe? </li></ul></ul><ul><ul><li>* unladen African Swallow </li></ul></ul>
22. 22. <ul><li>Momentum equation </li></ul><ul><ul><li>Find mass </li></ul></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><li>Mass = momentum </li></ul><ul><li>velocity </li></ul><ul><li>m = p </li></ul><ul><li>v </li></ul>
23. 23. <ul><li>Example… </li></ul><ul><ul><li>Remember your units </li></ul></ul><ul><ul><li>What is the mass of a train with a momentum of 300 g * m/s traveling at a velocity of 10 m/s towards the front door? </li></ul></ul>
24. 24. <ul><li>Momentum equation </li></ul><ul><ul><li>Find velocity </li></ul></ul><ul><ul><li>Remember your units! </li></ul></ul><ul><li>velocity = momentum </li></ul><ul><li>mass </li></ul><ul><li>v = p </li></ul><ul><li> m </li></ul>
25. 25. <ul><li>Example… </li></ul><ul><ul><li>Find velocity </li></ul></ul><ul><ul><li>Remember your units </li></ul></ul><ul><ul><li>What is the velocity of a baseball traveling with a momentum of 290 g * m/s if it has a mass of 145 g? </li></ul></ul>
26. 26. <ul><li>Practice problems </li></ul><ul><ul><li>Page 255: # 1, 3 </li></ul></ul><ul><ul><li>Page 257: #1a, 1c, 1e </li></ul></ul><ul><ul><li>Page 258: # 7-9 </li></ul></ul>