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hi

One Dimensional Motion

Name:
Sushmita Dhital

Download and install the “Moving Man” simulation from:

https://phet.colorado.edu/en/simulation/legacy/moving-man

Familiarize yourself with the simulation. Play around with the settings, change the position, velocity and acceleration, record the motion, and playback in slow motion. When you are finished testing all the settings, click on the “Reset All” button.

Step 1: Set the velocity 0.5 m/s by typing 0.5 in the velocity box. Click on the play button, the man will start moving towards the house. Pause the motion between the 8 and 10-meter marks, before the man hits the wall.

Step 2: Click on “Playback” button. Then click on the “Play” button to play back your measurement that you recorded in Step 1, notice that a vertical bar scans through the graphs and the corresponding position, velocity and acceleration values are displayed for each time of the man’s motion, time is displayed on the horizontal axis of the graph.

Step 3: Click the “Rewind” button and then “Play” to playback again, and “Pause” after a few seconds. Now use the mouse to drag the vertical scanning bar to time 8 s (the center of the bar should be exactly at 8 s mark on the horizontal axis of the graph). What is the position displayed in the “Position” box?

Position (at time = 8 s) =

Did you expect this to be the position of the man at time = 8 s (based on your initial settings of the simulation), explain your reasoning?

Your answer:

Step 4: Click “Play” and keep an eye on the velocity and acceleration boxes.

How does the velocity change as the time and position change?

Your answer:

How does the acceleration change as the time and position change?

Your answer:

Step 5: Click the “Reset All” button. Type “-10” in the position box, “0.1” in the velocity box, and “0.2”in the acceleration box. Click “Play” and observe the three graphs carefully. Pause the motion between the 8 and 10 meter marks, before the man hits the wall.

Step 6: Click the
button to minimize the velocity and acceleration graphs. Is the “position versus time” graph a straight line or a curve?

Your answer:

Step 7: Minimize the position and click on the
button to expand the velocity graph. Is the “velocity versus time” graph a straight line or a curve?

Your answer:

Step 8: Use the playback feature to find the velocity at time 4 s and at time 8 s. When you drag the vertical scanning bar across the graph, the time is displayed below the simulation menu (next to the man), and the velocity is displayed in the velocity box.

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