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W3.3 - Physics for Scientists&Engineers 1 1 Physics for...

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Unformatted text preview: January 18, 2008 Physics for Scientists&Engineers 1 1 Physics for Scientists & Physics for Scientists & Engineers 1 Engineers 1 Spring Semester 2008 Lecture 11 January 18, 2008 Physics for Scientists&Engineers 1 2 Moving Reference Frames Moving Reference Frames So far: we moved the origin of the coordinate system to a location that is convenient for calculations • Example: shifting x so that x 0 = 0 at the start of a projectile’s trajectory Until now we have always kept the coordinate system in the same place during the motion that we want to describe. But there are some situations for which a moving coordinate system is necessary • Example: Airplane landing on a moving aircraft carrier January 18, 2008 Physics for Scientists&Engineers 1 3 Example: Airport Walkway Example: Airport Walkway Person walking with a velocity v w , as measured by an observer moving along with him on the walkway. Walkway surface moves with v wt relative to terminal. Two velocities add as vectors Velocity of person as measured by someone standing in the terminal: v t = v wt + v w January 18, 2008 Physics for Scientists&Engineers 1 3 Example: Airport Walkway Example: Airport Walkway Person walking with a velocity v w , as measured by an observer moving along with him on the walkway. Walkway surface moves with v wt relative to terminal. Two velocities add as vectors Velocity of person as measured by someone standing in the terminal: v t = v wt + v w January 18, 2008 Physics for Scientists&Engineers 1 4 Moving Reference Frames Moving Reference Frames Demand that reference frame (= coordinate system) moves...
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W3.3 - Physics for Scientists&Engineers 1 1 Physics for...

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