The Moving Man SIM This is the part of lecture utilizing PhET’s “Moving Man” simulation and all of its activities. It is probably most useful for demonstrating.

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Presentation transcript:

The Moving Man SIM This is the part of lecture utilizing PhET’s “Moving Man” simulation and all of its activities. It is probably most useful for demonstrating and clarifying negative and positive position/velocity/acceleration, which difficult if position, velocity, and acceleration have never been conceptualized this way.

+ Position time - Velocity Demo 4: Sketch position vs time and velocity vs time graphs for when Moving Man: walks steadily towards the tree for 6 seconds, then stands still for 6 seconds, and then towards the house twice as fast as before for 6 seconds. Do yours as dashed line, compare with team members then make solid line based on group. + - Position time Velocity 5 s 10 s 20 s 15 s

+ - + - + - + - A B C D Velocity time Position 5 s 10 s 20 s 15 s - time Position 5 s 10 s 20 s 15 s Velocity + - time Position 5 s 10 s 20 s 15 s Velocity + - time Position 5 s 10 s 20 s 15 s C Velocity + - time Position 5 s 10 s 20 s 15 s D

Moving Man walks from the house to the tree: -10 0 meters 10 10 0 meters -10 Choose to define positive direction as towards house. Choose to define positive direction as towards tree. Sketch graphs for Moving Man walks from the house to the tree: + - Position time Velocity 5 s 10 s 20 s 15 s + - Position time Velocity 5 s 10 s 20 s 15 s

How do the graphs in these 2 cases compare? case a. positive towards house. case b. positive towards tree. How do the graphs in these 2 cases compare? The position vs time graphs are different; the velocity vs. time graphs are the same. Both the position vs. time and velocity vs. time graphs are different. Both the position vs. time and velocity vs. time graphs are the same. The position vs time graphs are the same. The velocity vs. time graphs are different. I can’t make sense of these graphs.

Moving Man walks from the house to the tree: -10 0 meters 10 10 0 meters -10 Choose to define positive direction as towards house. Choose to define positive direction as towards tree. Sketch graphs for Moving Man walks from the house to the tree: + - Position time Velocity 5 s 10 s 20 s 15 s + - Position time Velocity 5 s 10 s 20 s 15 s notice slopes and velocities

Human Motion + Position time - + Velocity time - Demo 4: Sketch position vs. time and velocity vs. time graphs for when moving man - walks steadily towards the tree for 6 seconds - then stands still for 6 seconds, and - then towards the house twice as fast as before. Draw your graphs with dashed lines, compare results with team members and then use solid lines based on group results. + - Position time Velocity + - time 5 s 10 s 15 s 20 s

How many times does the man’s speed go to zero? Never Once Twice Three times Four times