# Introductory Work due to Friction equals Change in Mechanical Energy Problem

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The equation Work due to Friction equals Change in Mechanical Energy can often be confusing for students. This video is a step-by-step introduction in how to use the formula to solve a problem. Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:

0:09 The problem

1:29 Why we can use this equation in this problem

1:52 Expanding the equation

2:29 Identifying Initial and Final Points and the Horizontal Zero Line

3:00 Substituting into the left hand side of the equation

4:05 Deciding which Mechanical Energies are present

4:59 Where did all that Kinetic Energy go?

5:27 Identifying which variables we know and do not know

5:58 Solving for the Force Normal

6:57 Substituting Force Normal back into the original equation

8:09 Why isn’t our answer negative?

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Previous Video: Introduction to Mechanical Energy with Friction

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