phy2020_Force and Motion Assignment

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University of Central Florida *

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2054

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Aerospace Engineering

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Dec 6, 2023

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Force and Motion Assignment Complete the following exercises and answer the questions using the Force and Motion PhET simulation. PART A. TUG OF WAR The sim should open in the Net Force tab. If it does not, click the tab to activate Tug of War. In this sim, a wagon (W) can be pulled by the players of two teams. Both Blue Team and Red Team have four players, one adult (A), a teenager (T), and two children (C). The adult is the largest player, the children are the smallest players. 1. Even Steven. If you arrange identical teams in the Tug of War, you’ll get a tie. The net force is zero. The following are examples of identical teams: A---W---A (Adult vs. Adult) C-T---W---C-T A-T-C-C---W---C-C-T-A a. Describe three distinct ways to arrange the teams so that you get a tie even though the teams have different numbers of players. These are non-identical, balanced teams. (To show distinct arrangements, don’t simply switch players on each side. For example, A-C---W---T and T---W--- A-C are not distinct. (Nor do they produce a tie.) i. C-A---W---C-A ii.C-C---W---C-C iii.A-T---W---T-A 2. The Electric Slide. a. Arrange an unbalanced tug of war by placing only one player on the rope. One team will have an active player; the other team will be completely unmanned. Click the on-screen Go button, wait two full seconds, the click the on-screen Pause button. At this point, the wagon was moving and the one-player team was winning.

b. While the action remains paused, add player(s) to the other team so that the two teams are balanced (the net force is zero). i. Prediction. While the action remains paused, predict what will happen when the sim is unpaused and action resumes with the newly balanced teams. -the force is balanced so the wagon will go back in the middle ii. Observation. Now unpause the sim and record your observation of what happens. - the wagon kept going towards the winning side. The side where the first player was added iii. Explain. Use the Law of Inertia to explain why this happens. - the law of inertia basically means that things will stay the way the were. So what happened here was that the wagon was moving towards left and when I added a player on the right side it didn’t change anything because of law of inertia, which means that the wagon kept moving towards left because that is where it was moving first PART B: MOTION Click the Motion tab to select the Motion activities. 1. PhET Girl a. In the on-screen control panel, the Force checkbox should already be selected. Click the Speed checkbox to activate the speedometer. Set the PhET Girl on the skateboard. Use maximum Applied Force to get her up to speed as rapidly as possible. i. What happens when she reaches maximum speed? (Discuss the pusher, the motion of the girl, and the grayed-out—unavailable—section of the Applied Force control.) - when the girl reaches the maximum speed the pusher leaves her and she keeps moving. The motion of the girl will start from a lower speed and gradually accelerate in the direction of the

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