Motion Graph Matching

| Motion Graph Matching |

Figure 1

In this experiment we will explore the use of the Distance sensor to create position and velocity graphs. You will walk back and forth in front of the Distance sensor and observe graphs of your motion. You will try to produce a graph that matches the graph presented to you.

einstein™Tablet+ with MiLAB or Android/iOS Tablet with MiLAB and einstein™LabMate Distance sensor Distance adaptor (if you using a DT sensor) Masking tape

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| Motion Graph Matching |

1.

Launch MiLAB (

).

2.

3.

Connect the Distance sensor to one of the ports on the einstein™Tablet+ or einstein™LabMate.

Make sure that only the Distance sensor is selected.

Program the sensors to log data according to the following setup: Distance sensor

Distance (outgoing) (m)

Rate:

25/sec

Duration:

2 Min

1.

2.

3.

Place the Distance sensor on a table so that it points toward an open space which is at least 4 m long (see Figure 1).

Use short strips of masking tape on the floor to mark the 1 m, 2 m, 3 m, and 4 m positions from the Distance sensor.

Produce a graph of your motion when you walk away from the Distance sensor with constant velocity.

To do this, stand about 1 m from the Distance sensor and have your lab partner tap Run ( recording data. Walk slowly away from the Distance sensor.

4.

When you reach the 3 m mark, ask you partner to tap Stop (

5.

Tap Save (

6.

Repeat steps ‎3 to ‎5 to match the following graph (Figure 2):

) to save your data.

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).

) to begin

Distance (m)

| Motion Graph Matching |

Figure 2: Position vs. Time graph

Program the sensor to log data according to the following setup: Distance sensor

Velocity (outgoing) (m/s)

Rate:

25/sec

Duration:

2 Min

1. Place the Distance sensor on a table so that it points toward an open space which is at least 4 m long (see Figure 1).

2. Use short strips of masking tape on the floor to mark the 1 m, 2 m, 3 m, and 4 m positions from the Distance sensor.

3. Produce a graph of your motion when you walk away from the Distance sensor with constant velocity.

To do this, stand about 1 m from the Distance sensor and have your Lab partner select Run (

) to begin

recording data. Walk slowly away from the Distance sensor.

4. When you reach the 3 m mark, ask your partner to select Stop ( 5. Tap Save (

).

) to save your data.

6. Repeat steps Error! Reference source not found.‎3 to ‎5Error! Reference source not found.and try to match

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| Motion Graph Matching |

Velocity (m/s)

the following graph (Figure 3):

Figure 3: Velocity vs. Time graph

For more information on working with graphs see: Working with Graphs in MiLAB. 1.

2.

3.

4.

5.

6.

7.

8.

Describe how you walked for the graph that you matched.

Explain the significance of the slope of a position vs. time graph. Include a discussion of positive and negative slope.

What type of motion is occurring when the slope of a position vs. time graph is zero?

What type of motion is occurring when the slope of a position vs. time graph is constant?

What type of motion is occurring when the slope of a position vs. time graph is changing? Test your answer to this question using the Distance sensor.

Describe how you walked in order to match the graph in Figure 3.

What type of motion is occurring when the slope of a velocity vs. time graph is zero?

What type of motion is occurring when the slope of a velocity vs. time graph is not zero?

Test your answer using the Distance sensor.

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