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Unformatted text preview: 10 Applying Newton's Laws F net = i F i = The basic equations are Newton's 1 st law or Newton's 2 nd law Equation hunting won't solve these problems Needed: Problem solving strategy apply the same pattern vary the approach to match the problem F net = i F i = m a ProblemSolving Strategy 5.1 Equilibrium problems Model : Make simplifying assumptions. Visualize : Physical representation. Identify all forces acting on the object and show them on a freebody diagram (FBD). Pictorial representation. The FBD is usually sufficient as a picture for equilibrium problems, but you still must translate words to symbols and identify what the problem is trying to find. Its OK to go back and forth between these two steps as you visualize the situation. Solve The mathematical representation is based on Newtons first law F net = i F i = The vector sum of the forces is found directly from the freebody diagram. Assess Check that your result has the correct units, is reasonable, and answers the question. Exercise 5.3 A 20 kg loudspeaker is suspended 2.0 m below the ceiling by two 3.0 m long cables that angle outward at equal below the ceiling by two 3....
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 Fall '06
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