This student sample was created to demonstrate understanding of California State 8th grade science standard 2d; Students know how to identify separately two or more forces acting on a single static object, including gravity, elastic forces due to tension or compression in matter, and friction. This is a short, two-minute video. Student narration is clear and simple.

Correction of definition of "normal force" and an introduction to the coefficient of friction. 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.' (09:25)

Introduction to friction - Khan Academy Presents: Correction of definition of "normal force" and an introduction to the coefficient of friction. Mr. Khan uses computer software for demonstration. (09:24)

Calculating the acceleration of on object sliding down an inclined plane with friction. This ten-minute 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.'

Concepts: Newton, Net Force, Unbalanced Force, Acceleration, Friction -------------- Part of a Blended Classroom taught at Millard West High School. Produced...

Fun with two masses, some wire, a pulley, and a ramp with friction. 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.' (10:15)

From nsf.gov, produced by National Science Foundation

This 5:25 long video shows how friction always creates heat in race cars. Brakes and tires depend on friction to work, but more friction isn't always better. In the engine, friction is never good and engine builders use everything from oil to high-tech coatings to get a little extra horsepower. A good lesson to show students how friction impact their life.

(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 equals 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 …

Determine if the book moves or not and the acceleration of the book. It’s all about static and kinetic friction.
Want friction-problem.html">Lecture Notes? This is an AP Physics 1 topic.

Content Times:
0:08 Reading and translating the problem
0:57 5 Steps to help solve any Free Body Diagram problem
1:26 Drawing the Free Body Diagram
2:24 Sum the forces in the y-direction
3:22 Sum the forces in the x-direction
4:56 The answer to part (a)
6:22 Solving part (b)

Bobby teaches the basics of friction and the differences between Static and Kinetic Friction. friction-intro.html">Want Lecture Notes?
This is an AP Physics 1 topic.

Content Times:
0:11 Basic definition of friction
0:40 What causes friction?
1:30 Static and kinetic friction demonstrated
2:10 Friction is independent of surface area
2:47 The direction of the force of friction

(01:39) Concepts: Fluid Friction, Terminal Velocity
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Part of a Blended Classroom taught at Millard West High School. Produced for Millard Public Schools by Justin Higgins.

In this game, students participate in a race where they utilize their knowldege of friction, the force between two surfaces. ( This link is for an interactive game and may take a few mimutes to load.)

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?

To help understand the force of friction, mr.p pulls on a wooden block using a force sensor. Want friction-graph.html">Lecture Notes?
This is an AP Physics 1 topic.

Content Times:
0:17 Drawing the Free Body Diagram
0:43 Summing the forces in the x-direction
1:21 Graph when the block doesn’t move
1:46 Graph with the block moving

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

The Force of Friction Equation is actually three equations is one. Learn why! Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:
0:00 The basic Force of Friction Equation
0:20 One Kinetic Friction Equation
0:39 The Two Static Friction Equations
1:40 Example Free Body Diagram
2:16 The direction of the Force of Friction
3:20 Determining the magnitude of the Force of Static Friction
4:09 Understanding the “less than or equal” sign
6:08 If the “less than or equal” sign were not there

We use Newton’s Second Law and Uniformly Accelerated Motion to experimentally determine the Static Coefficient of Friction between Tires and Snow. Want friction.html">Lecture Notes?
This is an AP Physics 1 topic.

Content Times:
0:09 Reading and translating the problem
1:03 Visualizing the experiment
1:16 Where to begin?
1:45 Drawing the Free Body Diagram
3:09 Summing the forces in the y-direction
4:47 Summing the forest in the x-direction
6:24 Uniformly Accelerated Motion
7:35 Solving for the coefficient of static friction
8:18 All 9 trials

Calculus based review of Newton’s three laws, basic forces in dynamics such as the force of gravity, force normal, force of tension, force applied, force of friction, free body diagrams, translational equilibrium, the drag or resistive force and terminal velocity. For the calculus based AP Physics C mechanics exam.
Want Lecture Notes?

Content Times:
0:18 Newton’s First Law
1:30 Newton’s Second Law
1:55 Newton’s Third Law
2:29 Force of Gravity
3:36 Force Normal
3:58 Force of Tension
4:24 Force Applied
4:33 Force of Friction
5:46 Static Friction
6:17 Kinetic Friction
6:33 The Coefficient of Friction
7:26 Free Body Diagrams
10:41 Translational equilibrium
11:41 Drag Force or Resistive Force
13:25 Terminal Velocity

Khan Academy Presents: Fun with two masses, some wire, a pulley, and a ramp with friction. (10:15) Sal Khan uses computer software and different colors for demonstration.

Mr. Higgins demonstrates the 4 types of friction: Static, Sliding, Rolling and Fluid. ------------------- If you like this series, please subscribe. Have sug...

From youtube.com, produced by Jonathan Thomas-Palmer

A book is resting on a board. One end of the board is slowly raised. The book starts to slide when the incline angle is 15°. What is the coefficient of static friction between the book and the incline? This is an AP Physics 1 Topic. (06:40)

Content Times:
0:01 The example
0:44 Drawing the free body diagram
1:41 Net force in the parallel direction
2:11 Demonstrating why the acceleration in the parallel direction is zero
3:58 Force normal does not equal force of gravity
4:32 Net force in the perpendicular direction
5:07 Return to the parallel direction
6:06 Substituting in numbers

In order to use Newton’s Second Law, you need to correctly draw the Free Body Diagram. This problem explains a common mistake students make involving the force applied. We also review how to find acceleration on a velocity as a function of time graph.

Content Times:
0:22 The problem
0:54 Listing our known values
1:51 Drawing the Free Body Diagram
2:17 A common mistake in our Free Body Diagram
3:32 Solving the problem
4:14 Another common mistake
5:07 Why is the acceleration positive?

Billy analyzes ABS brakes to show the difference between Rolling without Slipping and Rolling with Slipping. He also answers the question in the title of the video, but why would I write that in the description? Want Lecture Notes? This is an AP Physics 1 Topic.

Content Times:
0:17 ABS Brakes
0:40 Demonstrating Rolling without Slipping and Rolling with Slipping
1:36 How ABS Brakes work
2:18 Analyzing a car tire
3:34 The calculations

Please do not confuse the Coefficient of Friction with the Force of Friction. This video will help you not fall into that Pit of Despair!
Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:
0:00 The equation for the Force of Friction
0:17 Mu, the symbol for the Coefficient of Friction
1:21 Tables of Coefficients of Friction
2:49 Comparing the values of static and kinetic coefficients of friction
3:54 A typical range of values