Khan Academy
Khan Academy: Loop De Loop Answer Part 1
Watch as Sal Khan figures out the minimum speed at the top of a loop de loop for a car stay on the track. [6:04]
Khan Academy
Khan Academy: Visual Understanding of Centripetal Acceleration Formula
This video gives a visual understanding of how centripetal acceleration relates to velocity and radius. [9:47]
Khan Academy
Khan Academy: Race Cars With Constant Speed Around Curve
Using a racetrack as an example, this video demonstrates when acceleration could involve a change in direction and not speed.
Khan Academy
Khan Academy: Deriving Formula for Centripetal Acceleration From Angular Velocity
Sal Khan explains how to derive the formula for centripetal acceleration in terms of angular velocity using linear speed formula. [5:29]
Khan Academy
Khan Academy: Linear Velocity Comparison From Radius & Angular Velocity: Example
Sal Khan explains linear velocity from the radius and angular velocity using two pumpkin catapults with different arm lengths as an example. [5:30]
Khan Academy
Khan Academy: Distance or Arc Length From Angular Displacement
Relating angular displacement to distance traveled (or arc length) for a ball traveling in a circle. Derivation of formula for arc length.
Khan Academy
Khan Academy: Introduction to Centripetal Force
Introduction to centripetal force, which accelerates an object toward the center of the circular path.
Khan Academy
Khan Academy: Identifying Force Vectors for Pendulum: Worked Example
A worked example finding all force vectors acting on a pendulum moving in a horizontal circle. [2:58]
Khan Academy
Khan Academy: Identifying Centripetal Force for Cars and Satellites
Identifying forces or force components acting as the centripetal force for a car driving in a horizontal circle, a car driving in a vertical circle, and a satellite in orbit.
Khan Academy
Khan Academy: Identifying Centripetal Force for Ball on String
Identifying forces or force components acting as the centripetal force for a ball on a string moving in a horizontal circle. [5:05]