**Unit 3: Motion in
Two-Dimensions**

**Problem Set E**

**Problem 13:**

Use the diagram below to assist in your problem solving. A 187-Newton force is being applied at an upward angle of 30 degrees (theta) to accelerate a 26.1-kg box across a horizontal surface. If the coefficient of friction ('mu') between the surface and the object is 0.461, then determine the acceleration (in m/s/s).

- Read the problem carefully and diagram the physical situation (free-body diagram)
- Identify known and unknown information in an organized manner (write on diagram)
- 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

A discussion of basic principles related to Set E and
F_{net} = m•a problems is provided on the Set
E Overview page.

Detailed information and examples of F_{net} = m•a
problems are available online at The Physics Classroom.

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