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Describing Motion

Describing Motion . Physical Science Section 2.1. Motion. You can tell something moved if it has changed position relative to a stationary object Reference Point- stationary object- helps you know how far something moved Relative motion- motion may not be obvious

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Describing Motion

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  1. Describing Motion Physical Science Section 2.1

  2. Motion • You can tell something moved if it has changed position relative to a stationary object • Reference Point- stationary object- helps you know how far something moved • Relative motion- motion may not be obvious • Sitting in your chair, you are not moving relative to the room • You are moving relative to other planets

  3. Motion • Distance- how far on object moves • Measured in meters • Displacement- distance and direction of object’s change in position from the starting point

  4. Motion • Speed- Distance an object travels per unit time • Speed = distance/ time • Units of speed: m/s • Units of distance: m • Units of distance s • Constant speed- when an object neighter speeds up nor slows down • Cruise control

  5. Motion • Most of the time speed changes over time • Average Speed- a good way to describe speed of motion when speed in changing • Total distance traveled divided by total time of travel

  6. Motion • Instantaneous speed- speed at a specific point in time • Speedometer • Distance-time graph- slope represents speed • Plotting a distance-time graph • Distance on vertical • Time on horizontal • Make sure scales make sense with your data • Plot data points • Draw line connecting points

  7. Motion • Velocity- speed and direction • Must include N, E, W, S or left, right, up, down • Velocity changes continually around a race track

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