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Kahn Academy is a highly respected series of web-based tutorials covering virtually any subject imaginable. I have created direct links to those tutorials that I feel will be most helpful to you as a physics student.

### Mechanical Waves:

Introduction to Waves - This tutorial covers the basic wave definition, including wave pulses versus periodic waves, and the differences between transverse and longitudinal waves.

Introduction to Waves - This tutorial covers basic parts of periodic waves, frequency, period, wavelength and velocity

The Doppler Effect  - This tutorial covers the Doppler Effect as it pertains to sound waves.

The Doppler Effect -  This tutorial covers a mathematical derivation for the Doppler Effect.

### Scalars and Vectors:

Scalars and Vectors - This tutorial introduces you to some basics on vectors and scalars such as displacement and distance, and velocity and speed. You will also be presented with a new term called magnitude.

### 1D Kinematics:

What is Displacement? A non-video discussion on displacement.

What are Average Velocity and Speed? A discussion on average velocity and speed which includes a solved problem.

Speed and Velocity - This tutorial shows you how to determine speed and velocity. Dimensional analysis is also covered. Note: don't be confused by the symbols used for speed (r for rate) and displacement (s).

Finding Time - This tutorial teaches you how to algebraically manipulate variables to find time.

Finding Distance and Displacement - This tutorial consists of another manipulation of the same formula as seen in the last two tutorials.

Acceleration - This tutorial covers the basic concept of acceleration.

Acceleration of Fighter Aircraft - This tutorial covers acceleration using the metric system and a derivation when only displacement, initial and final velocities are known. Discussion of g is also injected into this tutorial in a nice manner.

Area under a Velocity vs. Time Curve - This tutorial explains how the area under a velocity vs. time curve is equivalent to distance or displacement.

What is the area under an acceleration vs. time curve? - A non-video tutorial that provides a good discussion with sample problems on acceleration vs. time curves.

How to choose the right Kinematics equation. - A series of lessons on how to solve kinematics problems.

Free-Fall - A series of lessons on free-fall.

### Projectile Motion:

Vectors in 2 Dimensions - How to analyze vectors that occur in more than one direction both graphically and through the use of trigonometry.

Graphical representation of Projectile Motion: - What does projectile motion look like graphically?

Horizontally Launched Projectile:  - How to analyze the motion of a horizontally launched projectile.

Projectile Launched at an Angle: - How to analyze the motion of a projectile launged at an angle other than zero degrees.

### Forces and Free-Body Diagrams:

Free-Body Diagrams - A tutorial on free-body diagrams (The predecessor to Fnet).

Newton's First Law of Motion - An introduction to Newton's 1st Law of Motion.

More of Newton's First Law of Motion - Further defining of Newton's 1st Law of Motion

Newton's Second Law of Motion - An introduction to F = ma.

Finding Fnet - How to find Fnet (The sum of all forces acting on an object)

Newton's Third Law - An introduction to Newton's 3rd Law of Motion (Ignore the discussion of the foot in the sand. He is trying to equate a gravitational force and the normal force as being a pair according to Newton's 3rd Law. This is not true. He is correct regarding why Fnet is 0. See my PowerPoint.)

More on Newton's Third Law of Motion - More discussion on Newton's 3rd Law of Motion and why the forces while equal but opposite do not cancel out. This one is good!

Free-Body Diagrams and Summing the Forces - Using Free-Body diagrams and trigonometry to sum up the forces in the x and y directions.

The Incline Plane - This discussion develops the mathematical relationships used to determine the normal force and the component of gravity that acts parallel to the incline. Concepts in geometry and trigonometry are presented.

Acceleration Down an Incline - This discussion covers the acceleration of a block of ice down an incline (no friction).

### Friction:

An Introduction to Friction - This is an introductory discussion to friction which covers both static and kinetic friction and their coefficients.

Calculating Static and Kinetic Friction - This video covers the basics of calculating both static and kinetic friction.

### Gravitation:

Gravity - An introduction to gravity.

More on Gravity - A discussion on free-fall and 1/r^2. (Good Stuff!!)

Even More on Gravity - Why do all objects fall with the same acceleration?

Acceleration on the ISS - Even though the acceleration due to gravity may not be zero, orbiting satellites such as the ISS experience zero gravity.

### Centripetal Motion:

Speed and Angular Velocity - A discussion on angular velocity and linear speed, which are constant. (A little advanced for Regents, but Honors level)

Period, Frequency and Angular Velocity - A connection between period, frequency and angular velocity.

The Effect of Radius on Speed - How the radius affects the speed and angular velocity.

Acceleration? - If an object is moving at contanst speed, can it be accelerating? This question is answered.

Derivation of Centripetal Acceleration - Discussion covers the algebraic derivation of centripetal acceleration (see my PowerPoint).

Deriving Acceleration from Angular Velocity - How centripetal acceleration is deriveed from angular velocity (advanced).

Centripetal Force - An introduction to Centripetal Force.

Centripetal Motion Problem Solving - Strategies for solving centripetal motion problems. (Good Discussion)

More Centripetal Motion Problem Solving - This video takes on an object moving in a vertical circular path.

More Centripetal Motion Problem Solving - A bowling ball traveling in a vertical circular path.

### Work & Energy:

An Introduction to Work and Energy - Your first lesson on Work and Energy.

Simple Work Problem - A simple yet understandable approach to solving work related problems.

The Area Under the Curve - Work equals the area under a Force vs. Displacement graph. (Only the first part is important for the Regents)

The Work-Energy Theorem - A derivation of the Work-Energy Theorem (W = change in KE).

Conservative vs. Non-Conservative Forces - A discussion on conservative vs. non-conservative forces (gravitational and spring forces vs. friction).

Introduction to Springs and Hooke's Law - A discussion on springs and Hooke's Law

Potential Energy of a Spring - A discussion on how to calculate the potential energy stored in a spring or the work done to stretch or compress a spring. The slope of the Force vs. Displacement curve as well as the rea under the curve are also discussed.

Conservation of Energy - A discussion of the Law of Conservation of Energy (One of the most important concepts in all of physics).

Energy Level Diagrams - Understanding conservation of energy through the use of energy level diagrams.

Power - A discussion of power (P = Work/Time).

### Momentum and Impulse:

Introduction to Momentum - An introductory discussion on momentum, including a derivation of the Impulse-Momentum Theorem. A problem is worked out with an inelastic collision and applying the Law of Conservation of Momentum.

Area Under a Force vs. Time Graph - An analysis of the motion of an object through a force vs. time graph (Area under the curve equals Impulse, which equals the change in Momentum).

Conservation of Momentum - A sample problem worked out on conservation of momentum.

More Conservation of Momentum - A sample problem where the initial momentum of the system is zero. Find the recoil velocity.

Elastic and Inelastic Collisions - A conversation on elastic vs. inelastic collisions.

### Electrostatics:

Fundamentals of Electrical Charge - A discussion on charge (positive, negative, like repel/opposites attract, elementary charge and the Coulomb).

The Law of Conservation of Charge - A discussion on the Law of Conservation of Charge.

Conductors and Insulators - A discussion on the properties of conductors and insulators. Charge by contact and induction are presented.

Coulomb's Law - A discussion on Coulombic attractive and repulsive forces, and how to calculate the force.

### Electric Fields:

Electric Fields - A discussion on what an electric field is.

Determining the Direction of an Electric Field - How the direction of an electric field is determined as well as the direction of the forces acting on charged particles.

Calculating the Electric Field - An alternate way to calculate the Electric Field due to a Point Charge.

Multiple Charges #1: - Understanding the direction of the net electric field when more than one charge is part of the system in one dimension. (The concept is most important)

Multiple Charges #2: -  Understanding the direction of the net electric field when more than one charge is part of the system in two dimensions. (The concept is most important)

### Electric Potential:

Electric Potential Energy - A discussion on electrical potential energy. Not exactly the same as my PowerPoint.

Electric Potential Energy of Charges - Video discusses how to determine the electric potential energy of a system of point charges. (Advanced Concept)

Voltage - A discussion on Electric Potential Energy and Electric Potential (a.k.a. Voltage) in an electric field. Video covers how the electric potential is calculated from the work done by moving a charge from one position in an electric field to another.

Electric Potential Difference - Calculating the electric potential and the electric potential difference between two points in space due to a point charge. (Advanced Concept)

Electric Potential of a System of Charges - A video discussion on how to calculate the electric potential of a system of point charges. (Advanced Concept)