# Purpose - PowerPoint PPT Presentation

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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

• 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”).