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Chapter 12

Chapter 12. Motion. 12-1 Frames of Reference. *Frame of Reference: object or point from which movement is determined (**the earth) -movement can be measured only with reference to something that is assumed to be fixed in place. 12-2 Speed and Velocity video #29 (speed, vel , accel ).

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Chapter 12

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  1. Chapter 12 Motion

  2. 12-1 Frames of Reference *Frame of Reference: object or point from which movement is determined (**the earth) -movement can be measured only with reference to something that is assumed to be fixed in place

  3. 12-2 Speed and Velocityvideo #29 (speed, vel, accel) *Motion: change in position relative to a frame of refer

  4. *Speed: distance / time -dist. in meters or km -time in sec or hr

  5. -constant speed: speed doesn’t change ~graph(slope is directly related to the speed) -aver speed: speed does change ~graph

  6. *Velocity: speed in a given direction

  7. How far did A go before it met B? • How long had they been traveling before they met? • How far did both travel at the same speed? • How long did it take both to get to the end? • Which had constant speed? • What was their speed(s)?

  8. 12-3 Acceleration *Accel: rate of change in vel. = final vel – original vel time

  9. -measured in meters per sec per sec *Deceleration: negative acceleration

  10. -graphing acceleration -distance-time graph for accel is always a curve

  11. -circular motionvideo #35(centri force-cool sci) -an object in circular motion is accel even though its speed may be constant *Centripetal accel: accel is directed toward the center of a circular path.

  12. 12-4 Momentumvideo #32(22 running with momen) *Momentum: mass multiplied by its velocity -depends on both its mass and velocity

  13. -conservation of momentum *Law of conservation of momentum: total momentum of any group of objects remains the same unless outside forces act on the objects Video #33 (espn sounds of summer)

  14. Practice Problems • http://www.ducksters.com/questions/physicsvelocity.php

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