8.1 Motion
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The document discusses key concepts relating to motion including speed, velocity, momentum, and the equations relating these concepts. It defines speed as distance traveled per unit of time, velocity as speed in a direction, and momentum as an object's mass times its velocity. It provides examples of using the speed, momentum, and related equations to calculate distance, time, mass, and velocity when given values for some of the other variables.
8.1 Motion
- 1. 8.1 Motion Pages 252-258
- 2. Goal 1 Understand the relationship between speed , distance , and time ; also solve speed equations.
- 3. Speed Distance traveled in a certain amount of time
- 4. Constant speed Distance covered per unit time remains the same
- 5. Speed Graph Y-axis distance X-axis time Faster Steeper slope Slower flatter slope
- 6. Speed equation (aka velocity equation) Remember your units! Speed = distance time v = d t
- 7. Example Remember your units! Find Ms. Acker’s speed if she traveled 10 meters in 20 seconds on her skateboard. d = t = v =
- 8. Speed equation (aka velocity equation) To find distance Remember your units! Distance = speed x time d = v x t
- 9. Example Remember your units! 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? d = v = t =
- 10. Speed equation (aka velocity equation) To find time Remember your units time = distance speed t = d v
- 11. Example… Remember your units! 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? t = d = v =
- 12. Goal 2 Distinguish between speed and velocity
- 13. Speed is distance per time Velocity is distance per time in a direction
- 14. Velocity or Speed? A lion ran at 12 m/s.
- 15. Velocity or Speed? A lion ran at 12 m/s towards the gate.
- 16. Velocity or Speed? A science 9 student walked 4 miles/hour.
- 17. Velocity or Speed? A science 9 student walked 4 miles/hour towards the ala carte line.
- 18. Goal 3 Understand momentum and use the momentum equation .
- 19. Momentum An object’s mass times it’s velocity
- 20. Momentum equation Remember your units! Momentum = mass x velocity p = m x v
- 21. Example… Remember your units What is the momentum of a 13 g swallow* traveling with a velocity of 10 m/s to Europe? * unladen African Swallow
- 22. Momentum equation Find mass Remember your units! Mass = momentum velocity m = p v
- 23. Example… Remember your units 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?
- 24. Momentum equation Find velocity Remember your units! velocity = momentum mass v = p m
- 25. Example… Find velocity Remember your units What is the velocity of a baseball traveling with a momentum of 290 g * m/s if it has a mass of 145 g?
- 26. Practice problems Page 255: # 1, 3 Page 257: #1a, 1c, 1e Page 258: # 7-9