# ch05_p61 71 - 61 The goal is to arrive at the least...

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61. The goal is to arrive at the least magnitude of & F net , and as long as the magnitudes of & F 2 and & F 3 are (in total) less than or equal to & F 1 then we should orient them opposite to the direction of & F 1 (which is the + x direction). (a) We orient both & & F F 2 3 and in the – x direction. Then, the magnitude of the net force is 50 – 30 – 20 = 0, resulting in zero acceleration for the tire. (b) We again orient & & F F 2 3 and in the negative x direction. We obtain an acceleration along the + x axis with magnitude a F F F m = = = 1 2 3 2 50 083 N 30N 10N 12 kg m / s . . (c) In this case, the forces
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