Purpose
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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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Purpose

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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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