Sal Khan looks at the speed necessary for the space station to stay in orbit. [6:35]

In this video, David from Khan Academy explains how to solve for the tension and speed of a mass swinging at an angle in a horizontal circle. [12:38]

In this video, David from Khan Academy explains how to find the normal force on a bowling ball rolling in a vertical loop. [8:48]

Using a racetrack as an example, this video demonstrates when acceleration could involve a change in direction and not speed.

Sal Khan explains how to derive the formula for centripetal acceleration in terms of angular velocity using linear speed formula. [5:29]

What's the different between a wind force and the force due to gravity? This video [4:02] covers both Newton's second law of motion and law of gravity.

In this video,you will find out how to determine acceleration by knowing the runway length and take-off velocity. Video includes step-by-step process to solve this problem. [14:15]

A video exploring the acceleration due to gravity at the space station. [10:12]

Figuring out the acceleration of ice down a plane made of ice. [10:36]

Kinematic equations help solve for an unknown in a problem when an object has either a constant velocity or constant acceleration. This video will help you choose which kinematic equations you should use, given the type of problem you're...

Impact of adding a third mass to our string-pulley system. [8:43]

Acceleration of two masses connected by string-pulley system. [9:35]

This video solves the problem of how long of a runway an A380 needs. [5:29]

Sal Khan figures out how long it takes an A380 to take off given a constant acceleration. [8:08]

A video exploring how to use Newton's second law when dealing with multiple forces, forces in two dimensions, and diagonal forces. Learn how to use F= ma to solve complicated physics problems. Video includes solved examples. [16:03]

What would fall faster on the moon, a brick, or a feather? Sal Khan answers this question in this video. [10:34]

Hank takes us on a quick tour of how thermodynamics is applied in chemistry using his toy trebuchet as an example, because he is a proud nerd. He explores the vast, somewhat confusing concept that everything - EVER - is comprised of...

Continuing in our journey of understanding motion, direction, and velocity. Today, Shini introduces the ideas of Vectors and Scalars so we can better understand how to figure out motion in 2 Dimensions. But what does that have to do with...

David shows how to solve a super hot tension problem where a can of peppers hangs from two diagonal strings. [16:55]

In this video, Sal Khan figures out the tension in the wire connecting the two masses. Then he figures out how much we need to accelerate a pie for it to safely reach a man's face. [9:28]

This video explains how to find the acceleration of two masses hanging from a pulley (using the easy method). [8:49]

This video explains how to find the acceleration of two masses hanging from a pulley (using the easy method). [15:26]

This video explains how to determine the normal force for a variety of scenarios (extra forces, diagonal forces, acceleration) involving a shoe on the floor. [10:44]

A video explaining that terminal velocity exists when the force of gravity equals the force of drag on an object. Video shows how terminal velocity exists in a wind tunnel. [4:08]