Phys 250 lab 2

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College of San Mateo *

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250

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Physics

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Jan 9, 2024

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pdf

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Uploaded by MagistrateSandpiperPerson1030

(C.M.) Chase Marangu Jaden Lee (JL) Miles Nguyen (MN) (YS) Yosef Samara Question 1 Projectile Motion Video Analyze your projectile motion video following the instructions above. Be sure to only include times when the object is flying through he air not touching anything; exclude times when the object is in your hand or landing. Make the graphs bigger and choose the "two graphs" option. Make the upper graph display "x(m)" and the lower graph display "X Velocity (m/s)". Note that if there are any outliers this likely indicates you made a mistake while placing points: identify the source of the incorrect point and correct the error. Once you have done this, upload a screen capture (Google how to take a screen capture using your computer if you don't know how to do so) of your computer screen showing: 1. A still picture from your video that shows the points you have placed. 2. The X vs. Time graph, zoomed in on the data as much as possible. 3. The X-Velocity vs. Time graph, zoomed in on the data as much as possible.

Question 2 Given the graphs above, how you would you describe the x-component of the motion: is it constant velocity, constant acceleration, or neither? If it is constant velocity or close to it, use a linear fit on the x vs. t graph to find the velocity. If it is constant acceleration (or close to it) is a linear fit on the x-velocity vs. t graph to find the acceleration. Report your result below. The x component of motion does not have a constant velocity or acceleration, as neither the slope of the velocity or position graphs are linear. The velocity does not have anywhere near a linear fit line. Question 3 Switch your graphs to Y(m) and and Y Velocity (m/s). Once you have done this, upload a screen capture of your computer screen showing: 1. A still picture from your video that shows the points you have placed. 2. The Y vs. Time graph, zoomed in on the data as much as possible. 3. The Y-Velocity vs. Time graph, zoomed in on the data as much as possible.

Question 4 Given the graphs above, how would you describe the y-component of the motion: is it constant velocity, constant acceleration, or neither? If it is constant velocity or close to it, use a linear fit on the y vs. t graph to find the velocity. If it is constant acceleration (or close to it) is a linear fit on the y-velocity vs. t graph to find the acceleration. Report your result below and comment on anything you notice. 1. If the velocity is constant, then the slope is constant (i.e., a straight line). If the velocity is changing, then the slope is changing (i.e., a curved line). If the velocity is positive, then the slope is positive (i.e., moving upwards and to the right). Therefore the graph above is neither a constant velocity nor a constant acceleration.

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Question 5 Vector Analysis of Motion We'll now use your video analysis, along with Google Slides, to do some graphical vector analysis of the motion. Start by identifying three evenly spaced points in the projectile's motion as it is moving upwards. If you only have a few points on the way up, choose three consecutive points. If you have many points that are close together you may wish to choose points spaced further apart (for example the 2nd, 4th, and 6th points in the motion). Try and avoid using points that are outliers. Follow these instructions on how to do vector analysis on these three points: Instructions on Vector Analysis (https://youtu.be/9t8Ak5v-ufk) Be very careful as you place the vectors: accuracy is vital here! You first drew a vector that connected the first and second points. What physical quantity (displacement, average velocity, instantaneous velocity, average or instantaneous acceleration, etc.) does this vector literally represent? What other physical quantity is this vector proportional to? This vector represents how much the ball moves in one 15th of a second, which is the displacement. Question 6 What physical quantity (displacement, average velocity, instantaneous velocity, average or instantaneous acceleration, etc.) is the red vector proportional to? The red (small) vector is proportional to the average acceleration of the ping pong ball.

Question 7 Repeat the steps above with a second set of three points spanning the top of the projectile's motion (so that one point is before the top, a second is near the top, and a third is on its way down). Skip the same number of points between the points you chose as before (for example if you used points 2, 4, and 6 in your first analysis, you might use use points 10, 12, and 14, but not 11, 12, and 13 in your second analysis). Finally, repeat the analysis again with a third set of points that occur during the downward motion. Zoom out so that the results of the three vector analyses are visible and take a screen capture and upload it here. Question 8 Compare your red vectors. What does this tell you about the acceleration of the ball as it flies through the air? All 3 red vectors point downward with roughly the same magnitude. This suggests that the acceleration of the ball is constant, as gravity would cause it to be. Question 9 Conduct video analysis of an object moving in circular motion with constant speed. As you place points in Video Analysis, place points for a full circle of motion, but no more. If a part of the circular motion is obscured try and start the tracking immediately after that part.

Observe the position graphs for both x and y motion. Comment on what you see- does it make sense? Question 10 Choose three sets of three points in different parts of the circular motion and conduct vector analysis as you did for the projectile motion. Take a screenshot showing your results and upload it here.

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Question 11 Describe the direction of acceleration of the tape as it moves around the circle. The acceleration points more-or-less toward the center for the entire cycle of the object’s motion. Question 12 The object is supposed to be moving at constant speed as it rotates. How, then, is it possible that it is accelerating? Its speed, the magnitude of its velocity is not changing. However, the direction of its velocity is changing.

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