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Purpose. Understand how and when objects accelerate. Understand the nature of acceleration. Understand the relationship of acceleration, velocity, and position versus time. Acceleration:. Any time the velocity changes , an acceleration occurs .

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Presentation Transcript
purpose
Purpose
  • Understand how and when objects accelerate.
  • Understand the nature of acceleration.
  • Understand the relationship of acceleration, velocity, and position versus time.
acceleration
Acceleration:
  • Any time the velocity changes, an acceleration occurs.
  • The direction ofacceleration is the same as that of change of velocity.

Be careful with this! For example, when a car applies its brakes, the velocity vector and acceleration vectors are in opposite directions.

equipment
Equipment
  • Carts with wheels rolling on tracks.
  • Motion sensors track position, velocity, and acceleration of carts versus time.
  • 4 different track configurations (do one of each)
    • Single flat track with one motion sensor
    • Single sloped track (put a wood block under one side of flat track) with one motion sensor.
    • Double track V-shaped with motion sensors at both ends
    • Double track, one track flat, the other sloped with motion sensors at both ends
  • Note for double tracks:
    • Two groups can work on a double track simultaneously
    • (analyzing cart motion from the two different sides).
    • Do not change the slopes of double tracks. Change to the other double track instead.
    • Motion sensors may need adjustment (see next slide).
adjusting the motion sensor if needed double track
Adjusting the motion sensor if needed (double track)
  • Make sure that cart can be detected properly by motion detector across the entire length of the track:
  • Hold cart at “other” (than motion sensor) end of the track.
  • Open Capstone activity “Changing Motion.ds”. Click “Record”.
  • Distance should read approximately 4m for double track for this position.
  • Gently push cart in direction of motion sensor. Does it track distance smoothly?
  • If tracking is poor, readjust motion sensor direction (Hint: it tends to track better if motion sensor is tilted slightly “upwards”).
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