Mechanics: Newton's Laws of Motion

Newton's Laws of Motion: Audio Guided Solution

Problem 15:

After a lead-off single in the 8^th inning, Earl makes an effort to steal second base. As he hits the dirt on his head first dive, his 73.2 kg body encounters 249 N of friction force. Construct a free body diagram depicting the types of forces acting upon Earl. Then determine the net force and acceleration.

Audio Guided Solution

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., v_o = 0 m/s; a = 4.2 m/s/s; v_f = 22.9 m/s; d = ???.
• 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.

Read About It!

Get more information on the topic of Newton's Laws of Motion at The Physics Classroom Tutorial.

• Newton's Second Law

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