Purpose

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# Purpose - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Purpose' - roana

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Presentation Transcript
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.
• 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
• 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)
• 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”).