Moderators: Paul Arden, stesiik
IMHO we don't need centrifugal force to explain how a cast works:If I hang a stone at the end of my fly line and want it to get highest possible speed. Would I better accelerate it following a straight rod tip path or swing it on a huge convex (half of a circle) move?
I think the last one results in much more speed for the stone? Shouldn't the last one have centrifugal forces helping to increase speed dramatically?
Good explanation in that video: centrifugal force is just the reaction to centripetal force. But even so it isn't acting on the marble, it is exerted by the marble on the string and hand.Bernd Ziesche wrote:
I agee.
I do not understand spoken English. If actually said in the video that centrifugal force is a reaction to the centripetal force, under the principle of action and reaction, in my opinion is a big mistake.Aitor wrote:Good explanation in that video: centrifugal force is just the reaction to centripetal force. But even so it isn't acting on the marble, it is exerted by the marble on the string and hand.Bernd Ziesche wrote:
Hi Alejandro,Alejandro wrote:Just like inertia is not a real force.
Hi Bernd,Bernd Ziesche wrote:can get pretty real in a car crash, if you did not fasten your seat belt?!Alejandro wrote:Just like inertia is not a real force.
(I understand why it is not a real force, too.).
Inertia keeps me in my chair, drinking beer and watching rugby instead of gardeningAlejandro wrote: That's the problem. A person moving at constant speed is not aware that if nothing prevents it continue to move in the same direction at the same speed forever.
It is difficult to understand that inertia is not a force in the classical sense (do not ask me what it is exactly inertia do not think anyone knows).
VGB wrote:
Inertia keeps me in my chair, drinking beer and watching rugby instead of gardening
... despite what physics says, my mass will increase
