Tornadoes, hurricanes, whirlpools, and water going down the drain all contain of a vortex. The video demonstrates how to create two vortices that travel together the length of a swimming pool. It explains the physics behind the concept...

How do satellites orbit the earth? Technically they are free-falling, but missing Earth's surface! Being explained in great detail and with entertaining animation, these concepts are sure to amaze your starling scientists! Another plus...

On June 7, 1692, at 11:43 am, the Jamaican city of Port Royal sank into the harbor, killing more than 2,000 people. The video explains this disaster and others that were caused by liquefaction, describes the conditions required, and...

A half-hour introductory video on mechanics and the metric system was produced with beginning physicists in mind. Note-taking guides are provided, in addition to a follow-up metric worksheet. For the lab, learners construct paper frogs....

Sal Khan explains how a block of wood is kept stationary by the force of friction (correction made in next video). [8:40]

A block of wood is kept stationary by the force of friction. (A correction to this video is made in the next video.) [8:41]

Sal Khan demonstrates how to calculate the coefficient of kinetic friction (correction made in next video). [9:08]

Calculate the coefficient of kinetic friction for a block that is on an incline plane with this video lecture. Video includes a step-by-step process for solving these types of problems. [9:09]

Corrects an numerical error in a previous video on how a block of wood is kept stationary by the force of friction.

Tires on a car in a NASCAR race are filled with nitrogen. The force of friction increases tire pressure as the car goes around the track. Using dry nitrogen gas helps with predicting the temperature and pressure of a tire during a race....

Students move past the misconception that friction inhibits our ability to do things by watching videos and participating in corresponding activities. Activities which range in difficulty include calculating the coefficient of friction.

A video lesson explaining how tension forces can be used to determine the force of friction acting on an object. [6:33]

In this video David shows how to find the energy generated by the force of friction and solves an example conservation of energy problem involving thermal energy. [14:47]

Friction always creates heat. Brakes and tires depend on friction to work, while the opposite is true of an engine. Engine builders use oil and high-tech coatings to get more power from an engine. [5:25]

An analysis of the components of the force due to gravity that are parallel and perpendicular to the surface of an inclined plane. [12:43]

This lesson demonstrates how tension forces can be used to determine the friction force acting on an object. It is 1 of 2 in the series titled "Tension Forces & Friction."

This tutorial provides a mathematical interpretation of kinetic friction as compared with a normal force. [4:27]

In this video lecture, the topics of static and kinetic friction are explored with examples. The video discusses free-body diagrams and the forces that affect the movement of objects. [9:49]

A video lesson investigating how frictional forces are involved in almost all of your everyday activities. Understand that the resistance you feel when sliding objects past each other or moving objects through water and air is friction....

This lesson explains the difference between static and kinetic friction. It is 1 of 2 in the series titled "Static & Kinetic Friction." [6:58]

Sal defines and compares tension, weight, friction and normal forces using free body diagrams. [8:03]

This lesson introduces the concept of friction and explains how it interacts with objects. It is 2 of 2 in the series titled "Introduction to Friction."

In today's episode of Crash Course Physics, Dr. Shini Somara tells us about static and kinetic friction; how they work and how they're different. [10:58]

Success in auto racing depends on the grip of a car's tires. Grip is the frictional force that holds the tires on the track. Aerodynamic features of a car also improve a car's grip. [5:02]