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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. ● It’s OK to go back and forth between these two steps as you visualize the situation. ● Solve The mathematical representation is based on Newton’s 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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This note was uploaded on 11/14/2011 for the course MECH 115 taught by Professor None during the Fall '06 term at Kettering.
 Fall '06
 None

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