Physics 163

Unit 3: Motion in Two-Dimensions

Problem Set A

Problem 1:

A man lost in a maze makes three consecutive displacements such that at the end of the walk he is right back where he started. The first displacement is 8.4 m westward, and the second is 7.9 m northward. Find the magnitude (in meters) of the third displacement.

• Read the problem carefully and diagram the physical situation (vector addition diagram)
• Identify known and unknown information in an organized manner (label vectors)
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Detailed information about the addition of vectors is provided online at The Physics Classroom.

Detailed information about the counter-clockwise convention (CCW) for expressing the direction of vectors is provided online at The Physics Classroom.

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