Physics 163

Unit 2: Newton's Laws of Motion

Problem Set B

Problem #5:

Dexter Eius is walking through the cafeteria when he slips on some spilled milk and falls to the floor. Upon hitting the floor, he skids to a stop with an acceleration of -6.8 m/s/s. Dexter weighs 789.6 Newtons. Determine the coefficient of friction between Dexter and the floor. (Do not include a + or - sign on your answer; enter your answer, accurate to the fourth decimal place.)

• Read the problem carefully and diagram the physical situation (free-body diagram)
• Identify known and unknown information in an organized manner (list on diagram)
• Take the time to plot out a strategy prior to beginning the solution (see graphic below)
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

General information about Set B concepts and principles can be found on the Set B Overview page.

The task of constructing a free-body diagram for a physical situation is discussed in detail at The Physics Classroom.

The task of determining an individual force value if given mass and acceleration information is discussed in detail at The Physics Classroom.

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