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Mechanics: Newton's Laws of Motion

Newton's Laws of Motion: Audio Guided Solution

Problem Set NL7, Question 6:

Consider the free-body diagram shown at the right. The values of the individual forces are:
 
Fgrav = Fnorm = 24.0 N
Ftens = 39.5 N
Ffrict = 12.2 N
 
Use the force values to determine the …
a.  … net force on the object
b.  … the mass of the object
c.  … the acceleration of the object




 

Audio Guided Solution

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Habits of an Effective Problem Solver

  • Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
  • Identify the known and unknown quantities in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., m = 3.52 kg; a = 4.2 m/s/s; Fnet = ???.
  • Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
  • Identify the appropriate formula(s) to use.
  • Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.


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