# lec04 - Physics I Class 04 Newton's Second Law for More...

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04-1 Physics I Class 04 Newton’s Second Law for More Complex Cases Rev. 27-Jan-06 GB

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04-2 Newton’s Second Law - A Review Newton’s Second Law: a m F F net = or m F a net = In a complex situation, we will need to apply this to more than one object and/or in more than one dimension. When we do this, we will get a set of linear equations and we will solve them for the unknown quantities.
04-3 Using Newton’s Second Law to Solve Complex Problems 1. Identify all forces acting on the object. Today: Gravity, normal, and ropes/strings. 2. Choose a coordinate system. If you know the direction of acceleration, one coordinate axis should be in that direction. 3. Draw a “Free-Body Diagram.” We will use two dimensions today. 4. Express the force vectors in components. We will use trigonometry today. 5. Use Newton’s Second Law to write one equation for each direction considered. 6. Solve the equations.

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04-4 Atwood’s Machine Measuring “g” We assume that the string and pulleys are massless and frictionless. Mg
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lec04 - Physics I Class 04 Newton's Second Law for More...

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