9/25/2023 0 Comments Phet projectile motion![]() ![]() Come up with a group consensus on the value of the initial speed that will allow the projectile to hit the target. Show your work for this prediction here: Check your prediction with the other members of your group. What is the significance of the small circles that the simulation places on the trajectory? What do you notice about those symbols in this case, with the different launch speeds? Now, set the launch angle to 30°, and again predict what the initial speed should be so that the projectile hits the target. Boston University Studio Physics – Phet Projectile Motion Exploration page 6 Experiment with different launch speeds. Did you successfully hit the target? Yes No If not, repeat the process until you successfully predict a value of the initial velocity that will allow you to hit the target. What is your group predicted value? _ Now run the experiment. ![]() The simulation should now look something like this: Using the measurement tool: Measure the horizontal distance from the origin to the target: _ Measure the vertical distance from the origin to the target: _ Now, with the launch angle at 0°, predict what the initial speed should be so that the projectile hits the target. Click and drag on the support at the bottom left of the cannon, dragging it vertically upward and somewhat to the left, and then set the launch angle to 0°, so the projectile is launched horizontally. What is your predicted value of the initial angle? _ Boston University Studio Physics – Phet Projectile Motion Exploration page 5 Varying Launch Height: Now, re- set the cannon so that it launches projectiles from much higher than the target. Predict what initial angle will produce maximum range (range is the total horizontal distance traveled by the projectile), in the case when the projectile lands at the same level it was launched from. How does the range vary with launch speed? It is a linear relationship? Maximizing the range – You may want to hit the magnifying glass with the minus sign in it, a couple of times, to zoom out a little for this part. Fill out the table and make a plot: vi (m/s) (plot on x- axis) Range (m) (plot on y- axis) 0 Were you correct in your prediction? Explain. Find the range for several different values of initial speed (make sure you get values over the whole range of initial speeds available). Predict: What will happen to the range when you double the velocity? Range versus initial speed: Experiment 1: How does the initial speed affect the range of the projectile? Set the angle to 60 degrees. Boston University Studio Physics – Phet Projectile Motion Exploration page 2 For the rest of the lab, have the simulation in “Lab” mode. It’s a good idea for each member of the group to do a calculation (maybe even different ways) so you can double-check your method. Then verify the value the simulation is using for g. Describe your strategy here, detailing the steps: Compare strategies with the other students in your group. Note that the simulation has a helpful blue measurement tool which, when placed on one of the dots, tells you the time, horizontal position, and vertical position for that point on the trajectory. Come up with a strategy to verify what value the simulation is using for g. Finding g: Use these settings - an angle of 60° and an initial speed of 18 m/s. Choose your favorite projectile…does it matter which one you choose? Now draw a diagram of the situation in the box to the right, labeling all relevant quantities. Click-and-drag on the target to move it horizontally to the impact point on the ground. Spend 5 minutes just playing with the simulation to see what it can do. ![]() Download Phet Projectile Motion Exploration page 1 and more Physics Lecture notes in PDF only on Docsity!Boston University Studio Physics – Phet Projectile Motion Exploration page 1 Name:_ Group: _ Section:_ Lab 2: Phet Simulation – Projectile Motion Phet simulations are simulations on all sorts of topics (not just physics) that come from the University of Colorado - Boulder To find the simulation, either Google “Phet simulation projectile motion” or go directly to this link: Click “Intro.” When the simulation opens, hit the “Fire” button.
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