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# PPT Position And Motion

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### Transcript

• 1. Position and Motion
• 2. What is motion?
• Motion is when an object changes position.
• How do you know that the racecar moved?
• It changed its position on the track.
• 3. How can you tell something has changed position?
• In order to see if something has changed position (motion) you need a reference point.
• For example, the starting or finishing line of a racetrack.
• 4. What is distance?
• Easy question!
• Distance is how far an object has moved.
• We measure distance in METERS!
• 5. What is displacement?
• Suppose a runner jogs north to the 50-m mark and then turns around and runs back south 30-m.
• Total distance is 80-m.
• Two directions - north and south.
• Displacement is the distance and direction.
• 6. What is the difference between distance and displacement?
• Distance is how far something has moved.
• Displacement is how far something has moved AND the direction it moved!
• 7. What is speed?
• Speed is the distance an object travels over time.
• Any change over time is called a RATE.
• Speed is the rate at which distance is traveled.
• 8. SPEED FORMULA
• Speed = Distance / Time
• S = D / T
• 9. Speed Example
• Suppose you ran 2 km in 10 min.
• S = D/T
• S= 2 km /10 min.
• S= 0.2 km/min.
• Remember the units!!!
• 10. Constant Speed…
• What does constant mean?
• If you are driving on the highway and you set your cruise control, you are driving at a constant speed.
• What would a constant speed graph look like?
• 11. Constant Speed Graph
• 12. Do you always go the same speed?
• No! Most of the time you are increasing speed, decreasing speed, or stopping completely!
• Think about driving a car or riding a bike!
• 13. What would a changing speed graph look like?
• 14. What is average speed?
• How do you find an average?
• Average speed is the total distance traveled over the total time
• Avg. Speed = Total D / Total T
• 15. What is Instantaneous speed?
• What does a speedometer in a car do?
• It shows how fast a car is going at one point in time or at one instant.
• Instantaneous speed is the speed at a given point in time.
• 16. What is Velocity?
• Speed is how fast something is moving.
• Velocity is how fast something is moving and in what direction it is moving.
• Why is this important?
• Hurricanes
• Airplanes
• 17. Speed or Velocity?
• If a car is going around a racetrack, its speed may be constant (the same), but its velocity is changing because it is changing direction.
• 18. Speed or Velocity?
• Escalators have the same speed (constant), but have different velocities because they are going in different directions.
• 19. Is it moving?
• Is the earth moving right now?
• How do you know?
• How did the countries get where they are today?
• How do you know?
• 20. Is it still moving?
• Are continents still moving?
• How do you know?