Motion (moving man)v.3

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Physics

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Feb 20, 2024

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Name: Alyson Dacne GES 101 Moving man Purpose: In this lab you will use the Moving Man PhET Simulation to understand concept in motion. Review slopes in the last page before starting on the lab. Part I: Meaning of position, velocity and acceleration 1. Load the Moving Man Simulation at https://phet.colorado.edu/en/simulation/legacy/moving-man . 2. Select the Introduction tab . A man is standing at a position x=0. Change the value of the position to x=1m, 2m, and 3m. In which direction (left or right) does the man get displaced? Right 3. Bring the man back to center x=0. What values of position do you need to select to make the man positioned to the left? Mention some values of x used. Volecity -1 4. Press reset before each trial. Observe the motion of the man for the following set of parameters and press RUN: a. Position x = 0, acceleration = 0, velocity = 1 m/s. b. Position x = 0, acceleration = 0, velocity = 4 m/s. c. Position x = 0, acceleration = 0, velocity = -1 m/s. d. Position x = 0, acceleration = 0, velocity = -4 m/s. 5. From these observations, a. What happens when you increase the absolute value (ignore + or -) of the velocity? He goes faster or slower b. What does it mean having a negative velocity? (how is the man moving now?) He is going left instead or right c. Select position x = 0, velocity = +2 m/s, acceleration = +0.3 m/s 2 . RUN. Observe the motion of the man accelerating. According to your observation, having a positive acceleration in this case means ____III_____. (v = +2 m/s; a = +0.3 m/s 2 ) I. Moving fast II. Moving slowly III. speeding up IV. slowing down 1

Name: Alyson Dacne GES 101 d. Now position x = 2, change velocity to v= -2 m/s, acceleration stays at a = +3m/s 2 . RUN Observe the motion of the man. According to your observation, having a positive acceleration in this case means ___III_____. (v = -2 m/s; a = +0.3 m/s 2 ) I. Moving fast II. Moving slowly III. speeding up IV. slowing down Part II: Investigating graphs of position vs time with no acceleration (Review concepts like slope of a straight line; greater and lesser slope; positive and negative slope – see last page) 1. Click on the Charts tab to explore how the motion of the moving man can be graphed. Leave the posi%on – %me graph , and the velocity – %me graph open , but close the accelera=on-=me graph (click on the red minus sign). Your screen should look like this. 2. Below are a series of scenarios. You will first make a prediction, then plug appropriate numbers in the simulation to verify or correct your prediction. Draw the plots of position and mention what value of v (including + or -) and a (including + or -) were plugged in. 3. a. The man moves from the tree towards the house slowly at a constant velocity Predicted values to plugin Actual position-time graph 2

Name: Alyson Dacne GES 101 b. The man moves quickly from the tree towards the house at a constant velocity Q: How are scenarios a. and b. different; how does a graph of moving slowly differ from one for moving fast? That the velocity is in different places on the graph c. The man moves from the house towards the tree slowly at a constant velocity Q: How are scenarios a. and c. different; in what way are the two graphs different? That the man was going in different directions, from going right vs left. d. The man moves from the house towards the tree quickly at a constant velocity x = -8 v = 1 a = 0 X = -8 V = 1 A = 0 Predicted values to plugin Actual position-time graph x = -8 v = 1 a = 3 x= -8 v= 7 a= 0 Predicted values to plugin Actual position-time graph x = 8 v = -1 a = 0 x = 8 v = -1 a = 0 Predicted values to plugin Actual position-time graph 3

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Name: Alyson Dacne GES 101 e. The man is at rest at x=8 3. How are scenarios b. and d. different; in what way are the two graphs different? That the man was going in different directions when they were at the starting point. They would either go left or right dpending where they start. 4. Suppose this position – time graph represents the Man’s motion, starting at 0.0 m. x = 8 v = -7 a = 0 x = 8 v = -7 a = 0 Predicted values to plugin Actual position-time graph x = 8 v = -7 a = 0 x = 8 v = -7 a = 0 4

Name: Alyson Dacne GES 101 Describe the motion of the man for each time interval. Use terms like “ moving left/right” AND “moving fast/ slowly or not moving ”. i. 0 to 8 secs: moving left ii. 8 to 12 secs: not moving iii. 12 to 14 secs: not moving 8. Describe the motion of 1,2, and 3 in the graph shown: ( choices are: moving fast, moving slow or not moving ) 1 is moving slow 2 is moving fast 3 is not moving 9. Compare the speed of a Red, Green and Black car moving at constant speed in the graph. Indicate which one is moving fastest and which one is moving slowest Black is moving fast and Red is moving slow 10. Who is travelling faster A or B? A 11. A. Who is travelling to the left ? (A, B, C or D?) none B. Who is stationary? C C. Who is moving the slowest? D 5

Name: Alyson Dacne GES 101 Review sheet for slopes Recognize positive and negative slopes and smaller and larger slopes in each of them: 6

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