The concepts of work and power help us unlock and understand many of the physical laws that govern our universe. In this Lesson, Peter Bohacek explores the interplay of each concept when applied to two common objects---a lightbulb and a grandfather c...lock. (04:30)[more]

(04:58) Learn how to use Mechanical Energy when the Work done by Friction does not equal zero. Want Lecture Notes?
This is an AP Physics 1 topic.
Content Times:
0:09 When is Conservation of Mechanical energy true?
0:37 Work due to Friction equal...s the Change in Mechanical Energy
1:57 Determining the angle in the work equation
3:01 When the angle is not 180 degrees
3:50 What if the work done by friction is zero?
4:31 Always identify …
Next Video: Introductory Work due to Friction equals Change in Mechanical Energy Problem
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From youtube.com, produced by Jonathan Thomas-Palmer

An introduction to the physics equation for work, including a few basic examples of positive vs. negative work. (07:09)
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:07 The Work Equation
0:45 Physics work is not what you no...rmally think of as work
2:07 Example #1
2:46 Example #2
3:35 Example #3
4:10 Example #4
5:05 Joules, J, the units for work
5:43 Work is a Scalar
6:28 Better Off Dead
Next Video: Introductory Work Problem
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Previous Video: Physics “Magic Trick” on an Incline
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Use the integral and derivative to derive the Work-Energy Theorem or what I prefer to call the Net Work-Kinetic Energy Theorem. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:21 The integral definition of work
1:02 Net Work
...1:53 Substituting in for acceleration
2:40 Dealing with dv/dt
3:26 Changing the limits
3:50 Substituting in velocity
4:32 Taking the integral
4:56 Kinetic Energy!
5:16 The Theorem
5:42 Other energy equations
6:46 When can we use this equation?
Next Video: Work-Energy Theorem Problem by Billy
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Previous Video: Work due to Friction equals Change in Mechanical Energy Problem by Billy
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(05:56) Mr.p pushes a shopping cart so you can learn about the physics concept of work! Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:09 Reading and translating the problem
0:52 Demonstrating the problem
1:30 Better Off Dea...d
2:04 Drawing the Free Body Diagram
3:14 Solving for work with two common mistakes
4:45 Work done by the Force of Gravity
5:16 Work done by the Force Normal
Next Video: Introduction to Kinetic Energy with Example Problem
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Previous Video: Introduction to Work with Examples
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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.
Con...tent 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?
Next Video: Work due to Friction equals Change in Mechanical Energy Problem by Billy
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Previous Video: Introduction to Mechanical Energy with Friction
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From youtube.com, produced by Jonathan Thomas-Palmer

Billy does an example problem to review the work equation.
Want Lecture Notes? This is an AP Physics 1 topic.
This video expands on what we did in “Conservation of Energy Problem with Friction, an Incline and a Spring by Billy”. Please make sure y...ou watch that video first.
Content Times:
0:26 The problem
1:11 The level surface
1:29 The incline
2:21 The values[more]

From youtube.com, produced by Jonathan Thomas-Palmer

Enjoy learning from Billy as he solves a problem using Work due to Friction equals Change in Mechanical Energy. Want Lecture Notes? This is an AP Physics 1 topic. (05:37)
Content Times:
0:21 The problem
0:51 Work due to Friction equals Change in ...Mechanical Energy
1:31 Determining the Mechanical Energies
2:44 Solving for the Force Normal
3:52 Relating height final to displacement along the incline
5:03 Substituting in numbers[more]

(12:44) Learn with Billy as he uses the Work-Energy Theorem or what I prefer to call the Net Work-Kinetic Energy Theorem to solve a problem. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:36 The problem statement
1:02 The Net... Work-Kinetic Energy Theorem
2:03 The Net Work on the Horizontal Surface
3:39 The Net Work on the Incline
4:05 The Work done by the Force of Gravity
5:40 The Work done by the Force of Kinetic Friction
7:24 Substituting back into the Net Work equation
9:31 Positive vs. Negative Work
10:56 A generally overview of what happens to all the energies
11:57 Energy percentages
Need help understanding theta 1?
Next Video: Introduction to Power
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Previous Video: Deriving the Work-Energy Theorem using Calculus
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A conservation of energy problem where all of the energy is not conserved. This video, which is suitable for high school students, starts with a black screen because the instructor, in his conversational tone, uses it as a 'chalkboard.' Instructor us...es different colors for clarification. (10:04)[more]

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