Physics 163

Unit 2: Newton's Laws of Motion

Problem Set C

Problem #9:

A 71.9-Newton rightward force is applied to a 9.85-kg crate to accelerate it from rest across a horizontal surface. If the crate experiences a friction force of 53.5 Newtons, then determine the acceleration (in m/s/s). Enter a - value for a leftward acceleration.

• 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
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

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

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

The relationship between mass and weight is discussed in detail at The Physics Classroom.

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