Physics 163

Unit 2: Newton's Laws of Motion

Problem Set C

Problem #20:

Determine the amount of force (in Newtons) which must be applied to a 21.5-kg object to drag it to the right at a constant speed of 3.41 m/s. The coefficient of friction between the surface and the object is 0.678.

• 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 individual force value if given mass and acceleration information is discussed in detail at The Physics Classroom.

The relationship between the coefficient of friction and force of friction is discussed in detail at The Physics Classroom.

The relationship between mass and the force of gravity 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.

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