Ranking Task Sample, Exercises of Physics

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SG Ranking Task Sample I For a ranking task, each item wiil have a number of situations as illustrated. Your task will be to rank the items in a specific order. After ranking them you will be asked to identify the basis you used for the ranking and the reasoning behind your choice. [t is extremely important that you are careful to write out the proper ranking once you have determined what basis you are going to use, i.e,, make sure all of the situations are ranked in the proper order according to your basis. ‘The sample below shows how to rank items and what your explanation should be like. NOTE: Although the procedure for working the item is correct, the particular answer, which was chosen at random from actual student responses, may not be correct. Example: Shown below are eight cars that are moving along horizontal roads at specified speeds. Also given are the masses of the cars. All of the cars are the same size and shape, but they are carrying loads with different masses, All of these cars are going to be stopped by plowing into barrel barriers, All of the cars are going to be stopped in the same distance. Rank these situations from greatest to least on the basis of the strength of the forces that will be needed to stop the cars in the same distance. That is, put first the car on which the strongest force will have to be applied to stop it in x meters, and put last the car on which the weakest force will be applied to stop the car in the same distance. 12 més 7 16 m/s B 8in/s c Sms D Be ae) Be cas) Be ee) Be ee) m= 1200 kg m= (000 kg m= 1600 kg m= 1500 kg Oo ns : 12 més. F Simi . 10 u/s H wi m my “ m= 1200 kg m= 1600 kg m = 1500 kg. m=1100 kg. Greatest 1B 2_AF 3 4H SE 6C 7DG 8 Least Or, all cars require the same force. Please carefully explain your reasoning, Since acceleration is the change in velocity divided by the change in time and all the changes in times are the same, then I used the change in velocity. How sure were you of your ranking? (circle one) Very Sure Basically Guessed Sure 1 2 3 4 5 6 7 9 10 Notice in this example that two situations produced the same result for the ranking and that these were listed in the same answer blank. Such a possibility exists for all items. In the same way, it is possible that all of the situations will give the same result. If that occurs, and only if that occurs, the option of all equal, or all the same, should be chosen. Ranking Task Exercises in Physics: Student Edition xv