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Whether an object is moving or not depends on your point of view

Whether an object is moving or not depends on your point of view. An object is in motion when its distance from another object is changing Reference point: a place or an object used for comparison to determine if something is in motion.

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Whether an object is moving or not depends on your point of view

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  1. Whether an object is moving or not depends on your point of view • An object is in motion when its distance from another object is changing • Reference point: a place or an object used for comparison to determine if something is in motion. • An object is in motion if it changes position relative to a reference point.

  2. Speed • Speed: the distance an object travels per unit of time. It is a type of rate. • Rate tells you the amount of something that occurs or changes in one unit of time.

  3. Calculating Speed • Speed = Distance/Time Ex: Horse canters 21 meters in 3 seconds. Speed= 21 m 3 sec =7m/sec

  4. Constant Speed • If the speed of an object does not change, the object is traveling at a constant speed.

  5. Average Speed • To find the average speed you divide the total distance by the total time.

  6. Ave Speed Example • Ex: a cyclist travels 32 km during the first two hours and 13 km the final hour. • Distance=32km+13km=45km • Time= 2h+1h=3h • Average Speed= 45km 3h =15km/h

  7. Velocity • Speed in a given direction • You need to know both the speed and direction of an object’s motion to find the velocity.

  8. Acceleration • Rate at which velocity changes • Remember velocity involves 2 things: • Speed • Direction • Acceleration is increasing speed, decreasing speed, or change in direction

  9. Acceleration-Three Types • Increasing speed=Acceleration • Examples: List two examples from p. 303 • Decreasing speed= Acceleration= Deceleration=Negative Acceleration • Examples: List two examples from p. 303 • Changing direction • Some objects change direction without changing speed-Ferris Wheels or the Moon

  10. Calculating Acceleration • Acceleration=Final Velocity-Initial Velocity Time • Example of Units: m/s2 is meters per second per second • km/h2 is kilometers per hour per hour

  11. Calculating Acceleration • Airplane is traveling 40 m/s after 5 seconds. • What is its final velocity? • 40 m/s • What is its initial velocity? • 0 m/s • What is its time? • 5 seconds

  12. Calculating Acceleration • What is its Acceleration? 40 m/s – 0 m/s 5 seconds =8 m/s2 Mr. Burton is cool.

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