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- 1. Chapter 11: MotionChapter 11: Motion Section 1: Describing Motion
- 2. MotionMotion Motion occurs when: ◦ an object moves a certain distance in a certain amount of time ◦ an object’s position changes
- 3. DistanceDistance Distance is how far something has moved Measured in METERS, km, cm, mm, etc.
- 4. DisplacementDisplacement Displacement is the change in position of an object Also measured in METERS, km, cm, mm, etc.
- 5. SpeedSpeed Speed is the distance an object travels over the amount of time it takes to travel Measured in m/s (meters per second) Speed (m/s) = distance (m) ÷ time (s)
- 6. Calculating SpeedCalculating Speed 1. After driving for exactly 60 seconds, you have driven 600 meters. What speed were you driving? 2. After driving for 1 hour, you have driven 72 kilometers. What speed were you driving? a. Calculate the speed in km/hr b. Calculate the speed in m/s
- 7. Constant & Changing SpeedConstant & Changing Speed Constant speed means an object does not speed up or slow down. Changing speed means an object gets faster or slower.
- 8. Average SpeedAverage Speed We usually calculate the average speed: Average speed (m/s) = total distance (m) ÷ total time (s) Yesterday, John Doe ran 6 km in 30 minutes. Sometimes he sped up and sometimes he slowed down. What was his average speed? a. Convert 6km to m: 6km x 1000m/1km = 6000 m b. Convert 30 mins to sec: 30 min x 60sec/1min = 1800 sec c. Calculate avg. speed: 6000 m ÷ 1800 sec = 3.33m/s
- 9. Instantaneous SpeedInstantaneous Speed Speed can be measured at a certain point in time. For instance, if you are driving, your speedometer may read 30 mi/hr. You don’t have to drive for an hour for your car to know this – your speed is instantaneous.
- 10. Graphing SpeedGraphing Speed Distance and Time are variables! ◦ Independent Variable: time ◦ Dependent Variable: distance
- 11. Graphing Constant SpeedGraphing Constant Speed
- 12. Graphing Changing SpeedGraphing Changing Speed
- 13. Graphing Changing SpeedGraphing Changing Speed
- 14. Graphing Changing SpeedGraphing Changing Speed
- 15. VelocityVelocity Velocity is a measure of an object’s SPEED and DIRECTION. Velocity is measured by: velocity = displacement ÷ time v = d/t
- 16. Velocity & DisplacementVelocity & Displacement If you run around a circular track and end up in the same position you started, your displacement is 0. So is your velocity: v = 0/time, so v=0
- 17. Calculating VelocityCalculating Velocity 1. You walk down a winding road and end up 80 meters from your starting point. It took 1 minute and 20 seconds to walk from one end to the other. What was your velocity? 2. Was your speed greater or less than the velocity you calculated in #1?

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