Teaching Physics with the Physics Suite Edward F. Redish Home  Action Research Kit Sample Problems  Resources  Product Information  
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Below is shown the graph of the x position measured by a sonic ranger but the origin is shifted so that the 0 of the coordinate occurs at the equilibrium point of the system.
A. Assume that the graph represents the position of a wooden disk hanging on a spring from a bar and that x is the updown coordinate with + being up.

B. Now assume that the graph represents the leftright position of a pendulum and that x is positive to the right as shown.

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