101.F07.lecture4.multi

# 101.F07.lecture4.multi - PHY101 How the"world works I Fun...

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PHY101: How the “world” works I Fun with cornstarch?! See http://www.youtube.com/watch?v=f2XQ97XHjVw The Professor and Otto: Two-dimensional motion Let’s start with a pep talk about solving physics problems. G. R. A. S. P. Given: Write down all the givens Required: Write down the required variables Analysis: Analyze the problem in terms of the appropriate concepts/equations/diagrams Solution: Solve the problem with the insight from your analysis Paraphase: Understood what you have just done and can paraphase your answer G. R. A. S . P: Solution Once you have the equations written down and figured out what variable you need to solve for, then we can use algebra to isolate that variable. For example, given an equation y = xz , where z and y are given and x is “required”, we isolate x by multiplying both sides of the equation by 1 /z to arrive at x = y/z . What you do to one side of the equation, you must do the other! G. R. A. S . P: Solution What about adding vectors to solve a problem? Consider the vector, r , below: x y Origin r

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G. R. A. S . P: Solution What about adding vectors to solve a problem? Consider the vector, r , below: x y Origin r r is the sum of two simpler vectors, one in the + x direction r x and the other in the + y direction r y . Vectors are added head (arrow) to tail (no ar- row)!
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