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Unformatted text preview: the object. This is an application of Newtons second law to the gravitational attraction of Mars for the astronaut. 2 555 N or 3.7 m s 150 kg net Mars F W a g m m = = = = 20. We begin by using Newtons second law to find the net force on the block. ( 29 ( 29 2 10 kg 3 m s 30 N net F ma = = = We then realize that the net force is just the vector sum of the applied force (the tension) and the frictional force. If we take the direction of the applied force as positive, the frictional force is negative and we have net applied friction F F F =Therefore, 30 N 50 N 80 N applied net friction F F F = + = + = In terms of vectors, we have applied F net friction F F...
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 Fall '02
 GregoryFrancis

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