Energieerhaltung/Kreisbewegung

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Task: Calculate the angle Phi, wherein the mass m2 just raises the mass m1. 1.) m1 = 200 g, m2 = 100g 2.) m1 = 300 g, m2 = 100g Solution: At a ratio of 2:1 it is at 60 degrees, at 3:1, it is at 90 degrees. The calculation is quite demanding for the students and can be checked on the model. The length L can be varied by changing the position of the supporting table of m1. Since L will fall out in the calculation anyway, the length does not matter. Students can test it yet, if it really does not matter. Among the mass m1 is a paper strip with a weight attached (about 10g). With 0g of mass m1, the paper strip slips slightly and thus serves as an indicator of a balance between m1 and m2. The 300g weight is made by me. Magnets keep everything easily on a magnetic blackboard, on a whiteboard I propose to put a Post It under the Magnet of the table to increase friction. Note: Glue the two carbon-tubes into the two carriers with a 2k epoxy glue (UHU Plus, Endfest 300). Wash the open ball bearings in acetone, glue it in the role, and then grease with a drop of WD40 or thin oil. The magnet of the table has to be additionally glued, so it does not twist. A piece of blue tape on the table increases the friction of the paper strip, making the measurement more accurate. Material: 2 pcs. Carbon or aluminum tube, diameter 6mm, about 500mm long (Conrad Electronic, Item No. 220261 -62) 2 pcs. Ball bearings FAG 624 (13mm, 4mm, 5mm thick (Conrad Electronic, Item No. 186209-62) 3 pcs. Neodymium pot magnets 20x6mm, with M4 thread (Supermagnete.de, Item No. ITN-20) 7 pcs. M4x20 screws and washers 4 pcs. Nut or lock nut M4 2 pcs. M3x16 countersunk screw and 2 Stk.M3 Nuts