What is the parallelogram rule when drawing a free-body diagram? Especially with ramp problems, how would you generally want to approach solving them?

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter5: Newton's Law Of Motion
Section: Chapter Questions
Problem 71P: The traffic light hangs from the cables as shown. Draw a free-body diagram on a coordinate plane for...
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What is the parallelogram rule when drawing a free-body diagram? Especially with ramp problems, how would you generally want to approach solving them?

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