In this lesson our instructor talks about force and uniform circular motion. First, he discusses centripetal force and when does it come from. Then he talks about centrifugal force. Three complete example problems round up this lesson.
For something to stay in a circle at a uniform speed, it must have an acceleration constantly pointing in to the center of the circle. The acceleration's magnitude is |→a | = [(| →v |2)/r]. This is called centripetal acceleration.
To have an acceleration, there must be a force. We know →F = m→a, so we can combine that with our centripetal acceleration formula to get a formula for centripetal force:
F = m
The centripetal force on the object always points from the object to the center of the circle.
Centripetal force must be supplied by something. It must come from something else: a string, the rails of a roller coaster, etc.
Centripetal force is not a force in and of itself. It is a relationship that must be fulfilled by the net force on an object if the object is to remain in a circle.
Force & Uniform Circular Motion
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
This book includes a set of features such as Analyzing-Multiple-Concept Problems, Check Your Understanding, Concepts & Calculations, and Concepts at a Glance. This helps the reader to first identify the physics concepts, then associate the appropriate mathematical equations, and finally to work out an algebraic solution.