Physics 163

Unit 2: Newton's Laws of Motion

Problem Set B

Problem #2:

Claire deAisles applies a horizontal force to push a 78.6 kg supermarket crate at a constant speed of 1.2 m/s. If the coefficient of friction between the crate and the floor is 0.8, then determine the force (in Newtons) applied by Claire.

• 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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