Physics 163

Unit 2: Newton's Laws of Motion

Problem Set B

Problem #10:

A 19.4 kg object moving rightward across a horizontal surface with a speed of 9.7 m/s The coefficient of friction between the object and the surface is 0.761. Determine the time (in seconds) required for the object to stop.

• 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 accleration value if given values of individual forces is discussed in detail at The Physics Classroom.

The task of using kinematic equations to determine an unknown kinematic variable is discussed in detail at The Physics Classroom.

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