MiniLab 1 Moving Man Final Draft

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Apr 3, 2024

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Mini-lab 1 Moving Man Name of each participating group member: Open https://phet.colorado.edu/en/simulation/legacy/moving-man . 1. Move the blue sliding bar labeled “Position”. Do not slide the red or green bars. Now push the play button at the bottom of the screen and observe what happens. Slide the blue bar in the other direction, press play, and observe what happens. a. State your observations. In your own words, explain your observations. How does our textbook back up your explanations? Include relevant page numbers as you summarize the relevant textbook information. When you move the blue position bar, the man is moved in the direction the bar was moved and neither the velocity nor the acceleration bars move initially. When the position bar is moved in the other direction, both the other two bars move quickly in the same direction the position bar was moved, and then return to zero. The acceleration and velocity bars both move briefly because the man was moved. Velocity is a change in speed or direction, and acceleration is how quickly and in what direction velocity changes, which is explained in the first paragraphs of sections 3.2 and 3.3 of the textbook. Because we change the position (or direction) of the man from left to right or vice versa, his velocity is changing and he is accelerating, therefore both of those bars move. But because the man returns to standing still, both the acceleration and velocity bars return to zero. 2. Move the red sliding bar labeled “Velocity”. Do not slide the green bar. Now push the play button at the bottom of the screen and observe what happens. Slide the red bar in the other direction, press play, and observe what happens.
a. State your observations. In your own words, explain your observations. How does our textbook back up your explanations? Include a relevant page # as you summarize the relevant textbook information. When the velocity bar is moved, the moving man will move in whatever direction the bar was moved in. When you change the direction of the bar, the moving man moves in the other direction. Whenever you change the direction of the velocity bar, the acceleration bar also briefly changes. This is all because whenever you change directions, you are changing velocity and accelerating. As stated in section 3.3 (first paragraph) in the text, the velocity of something changes when its speed, direction, or both speed and direction are changed. Acceleration is how quickly and in what direction the velocity changed. So, because the velocity bar was moved, he changed directions. And because the velocity changed, the moving man also accelerated, and the acceleration bar showed how quickly and in what direction the velocity changed. 3. Place the man back in the middle and give him a velocity of your choice. a. Use an equation from our textbook to estimate his position after a certain amount of time of your choice. Explain and show your work below. Include a relevant page #. Velocity is the speed and direction of an object. Because we already know the direction, we can just consider the speed of the moving man. According to section 3.1 (first paragraph) of the textbook, speed is the distance covered per unit of time. The equation for this is Speed = distance/time. I set the man’s velocity to 1m/s, and I estimated that the man would travel 3m after 3 seconds. I got this estimate by plugging these numbers into the equation: Distance = 3m; Time = 3s 3m/3s = 1m/s.
4. Use the applet to experiment with different velocity and acceleration combinations (positive and negative values). Each time, observe whether the man is speeding up or slowing down. a. Is it possible to slow down the moving man by giving him a positive acceleration (without using the wall to slow him down)? Explain your answer and summarize the relevant textbook information (include a page #) to back up your explanation. Yes, it is possible. Velocity is a vector quality and includes both speed and direction, as stated in section 3.2 (first paragraph) in the textbook. Section 3.3 (first paragraph) explains that acceleration is how quickly and in what direction velocity changes. In the moving man applet, setting a negative velocity or acceleration means to move to the left, and a positive velocity or acceleration means to move to the right. Setting it at a negative velocity made the moving man move to the left. But by also setting it at a positive acceleration, he slowed down and changed direction. By giving him a positive acceleration and a negative velocity, the moving man will slow down before he changes direction.
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