Centripetal Force

I helped a friend (The Lovely Kim, who OWES ME!) edit a video for her Physics Class. Here is the finished result.

Category:

Howto & Style

Tags:

• Centripetal
• Force

[WarzSchoolchild]

@jj987987987 The 'Force' of Centripetal Acceleration is very real. This force is always perpendicular to the axis of rotation. "Centrifugal Force" is the 'imaginary' force resultant from the former 'Real' force. Engineers use it as a convenient component of their calculations. Another example that sounds like the same thing, is "Weight" and "Mass". Weight can change, but Mass remains the same.... Crash a "Moon-Buggy" into a moon rock, and the 'Mass' NOT the 'Weight' will do the damage!;?D)

[wolterh6]

@jj987987987 There is no actual force pulling a body rotating body away from its axis. The feeling of being pulled away is created by the circular motion, which according to Newton's First Law, is unnatural. The force making us stand on Earth is the force of gravity, which depends solely on the mass of the attracting bodies.

[jj987987987]

@wolterh6 why is it a fake force? isn't that the force make us standing on earth

[Gorsegrower]

@AfgSpartacus: While holding on the bodies are subject to both forces, which balance each other exactly, as the 3rd law states. If that were not true, their orbit would not be circular. When they let go both forces disappear simultaneously; now the bodies are subject to no force except gravity, so they fly off at a tangent to their original path.

[wolterh6]

In fact you feel a "centrifugal" force (fake force), or center escaping force, which is due to the constant changing of direction around a circle (now that objects tend to follow linear paths of motion). Centripetal force is what keeps pulling on you so you follow a circular path instead.

[Ompmovies]

If you pause like at 1:21 you can see her shorts got stuck to the pole lol

[rayzorium]

@numair23 That was actually my point. I was originally responding to spike0804; what I said should make more sense upon reading his comment.

In any case, you can't simply say that something doesn't exist just because it can be called something else. For example, nobody goes around saying that the Coriolis effect doesn't exist just because inertia is also responsible for it. That's what I meant when I said it was frivolous. It's as real as inertia itself; people just don't like the name.

[numair23]

@rayzorium nice critique, but if gravity stopped working, there wouldn't be a normal force in the first place. Centrifugal force doesn't exist. Think of the instantaneous acceleration of the people. This "centrifugal force" is just inertia reacting to the acceleration caused by the change in direction. Oh, and as for this "newton's third law" argument. The equal and opposite force you're looking for is also in their arms. They are pulling on the equipment, the equipment is pulling on them.

[rayzorium]

While centrifugal force is referred to as fictitious, that doesn't mean it isn't real - the word has a technical definition.

Also, how is Newton's third law so easily forgotten? Equal and opposite reaction! If centripetal force exists, so must something to react against it.

Finally, your example is fallacious. If gravity stopped working, would the normal force shoot you into space? Of course not.

Centrifugal force exists. Any claim otherwise is an exercise in frivolity.

[davsone]

Ehh what the video was about? I remember only a nice girl and her legs :)