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Describing Motion

Describing Motion. P: Identify the properties of objects that are in motion. Chapter 1 - Section 1 Notes. Q: How can an object be moving but not be in motion ?. Definitions. An object is in MOTION if its distance from another object is changing

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Describing Motion

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  1. Describing Motion P: Identify the properties of objects that are in motion Chapter 1 - Section 1 Notes Q: How can an object be moving but not be in motion?

  2. Definitions • An object is in MOTION if its distance from another object is changing • Reference point a place or object used for comparison to determine if something is in motion • In other words…An object is IN MOTION when it changes position relative to a REFERENCE POINT.

  3. Reference Points • Good Reference Points = stationary objects • (ex: tree, sign, building) • Bad Reference Points = any moving object • (ex: a moving car, a flying plane)

  4. Types of Motion • Straight line • Projectile • Circular • Vibrational

  5. Straight Line Motion • Occurs when an object moves in a STRAIGHT LINE • (ex: a moving car, plane or bicycle)

  6. Projectile Motion • Occurs when an object is thrown or projected • Moves in an arc/parabola • Ex: a shooting cannon ball, arrow from a bow, or a baseball pitch

  7. Circular Motion • Occurs when an object spins/turns on its axis • Ex: Earth, a top, a Ferris wheel

  8. Vibrational Motion • Occurs when an object moves back and forth rapidly • Ex: Sound waves, tuning forks, guitar strings, vocal chords, etc.

  9. Relative Motion • Whether or not an object is in motion depends on the reference point you choose! (See PAGE 8 in your textbook) *Are the skydivers in motion relative to each other? *Are they in motion relative to the airplane from which they jumped? *Are they in motion relative to the ground?

  10. Consider this… • Is it possible to be moving, but NOT be in motion?

  11. LOL _________________________ 1) Explain how an object can be moving but not be in motion. (Use the terms relative motion and reference point in your explanation.) 2) Compare and contrast the 4 types of motion. 3) List4 examples of objects that you observe in motion today/tonight. (Find at least 1 examples of each type). What is the reference point in each example?

  12. LOL(Challenge)__________________ 1) Explain how an object can be moving but not be in motion. (Use the terms relative motion and reference point in your explanation.) 2) Compare and contrast the 4 types of motion. 3) List 8 “real life” examples of objects that you observe in motion today/tonight. (Find at least 2 examples of each type)

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