Later in the problem anyway, so don't erase it. But what you write down in that process is probably gonna be useful If you pick the wrong direction, it'll just mean that you can't solve because there'll be too many variables. I mean, we've got this vertical direction or we've got this horizontal direction. And we typically only have two directions. But only use it for oneĭirection at a time. And, really, the only other step in this problem solving strategy, there's really only two steps, use Newton's second law. This'll be the total force of tension from the rope. So I'm gonna to label that force with a capital T. So the only other force on this mass is the force of tension. So the way we find the force of gravity is with the formula mass times 9.8. On this three kilogram sphere are the force of gravity. First, draw a quality force diagram for the object or objects in your problem. So that's why we should go over this, to make sure you haveĪ clean understanding of exactly what we meanīy all the different terms and to show you there'sĪ strategy you could use to solve any centripetal force problem. And if you don't have a problem solving strategy to use to tackle problems, this problem will expose you. If you don't have a cleanĬonceptual understanding of what we really mean by the terms when dealing with centripetal forces. Now this problem's aĬlassic for a good reason.

And this rope is making anĪngle of thirty degrees, with respect to this What is the tension in the rope? And what has to be the speed of the mass? And these are given variables. This thing from above, from below, it looks something like this. Maintain a constant height, it's not moving up or down, but it revolves in a horizontal circle, so if you were to view Given an initial velocity, so that it swings around This is the one where there's a mass, tied to a string, and that string is secured to the ceiling, and the mass has been

I want to show you how to do a slightly more sophisticated centripetal force problem, and this one's a classic.

Experiment physics drop rope