Newton would have made a first-rate skier! A video lesson analyzes Newton's second law from a skiing perspective. The narrator explains how the force, mass, and acceleration can work together to create a winning run.

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...

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...

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]

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 and quiz on how force must overcome inertia in order to produce motion.

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

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]

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]

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....

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

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]

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 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]

This video presentation explains what sliding friction is, and how it is experienced. [5:32]

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]

Video lesson serves as a primer on identifying balanced and unbalanced forces. [8:11]

The second part to a complicated problem. We figure out the tension in the wire connecting two masses. Then we figure our how much we need to accelerate a pie for it to safely reach a man's face. [9:28]

This lesson provides the learner with example problems involving tension forces. It is 1 of 2 in the series titled "Practice w/ Tension Forces."

This lesson provides the learner with example problems involving tension forces. It is 2 of 2 in the series titled "Practice w/ Tension Forces."

Learn about this simple machine, and see how it reduces the effort required to move certain objects through this fun and animated learning module.