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Lab 4: Projectile Motion, Work, and Energy

Lab 4: Projectile Motion, Work, and Energy . University of Michigan Physics Department Mechanics and Sound Intro Labs. Motion in Two Dimensions.

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Lab 4: Projectile Motion, Work, and Energy

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  1. Lab 4: Projectile Motion, Work, and Energy University of Michigan Physics Department Mechanics and Sound Intro Labs

  2. Motion in Two Dimensions

  3. You have previously studied motion in one dimension with both constant and non-uniform acceleration. These cases, although different in nature, could both be studied by applying a few basic physical principles. You will soon see that the same principles can be applied to the study of motion in two dimensions. You will undoubtedly have guessed that two-dimensional motion is more complicated than one dimensional motion, but again, the same basic principles govern the motion. You will also be able to examine motion using the concepts of work and energy, which can greatly simplify many physical problems. Webcam  The air table used in today’s experiment.

  4. In today’s lab, you will use a tilted air table and a webcam to track and study the motion of a launched projectile. The air table is the two-dimensional equivalent to the air track that you used in Lab 2. It provides a near frictionless environment. You will notice that there is a launcher in the lower corner of your air table. You will use this launcher to set the air table pucks in motion with approximately the same initial velocity.  Typical pucks that you will use in this lab.

  5. You will also be provided with several spacer blocks which you will use to raise the back edge of the air table. When you are ready to perform the experiment, you will need to turn on the air supply and insert a new video capture into LoggerPro®. Once you have set up the webcam you can begin taking video. You may need to adjust the position of your camera for the best results.  The air table can be tilted by placing spacer blocks under the back leg. You will use this table again in lab 7. The air puck launcher is attached here.

  6. Once you have captured a video, you will need to analyze the motion. You will do this by clicking the button in the lower right corner of the video capture window, and then clicking on ‘add points’. You will be prompted to click on the point in the center of the puck. Clicking will advance your video one frame, and you can select the next point. You will also want to set the scale using the ruler button and some easily measured dimension in your video, such as the puck diameter. The rest of the analysis is up to you.  This screen is an example of a LoggerPro® template used for analysis in this lab class

  7. When you have completed this lab, you will have explored three different cases of motion. You should have a better understanding of the concepts of work and energy and how they can be useful for building intuition about physical situations. Next week you will look at what happens when objects interact in collisions. See you in the lab!

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