Hello everyone,
I have a (hopefully) quick question regarding vertical circular motion.
Say you have a bucket connected to a string and you are swinging it over your head, I understand that the tension in the string at the top is much less than that at the bottom as at the top, gravity is actually helping the string maintain the circular motion. This means you have:
Top: F = mg + T
Bottom: F= T - mg
My question is, and I have only ever seen this come up in an exam once, what actually keeps the water in the bucket?
Almost my entire class got lost as our teacher attempted to explain this the other day but I could not get my head around it. If you draw a free-body force diagram, at no point is there an upward force on water when it is at the top of the circle. I understand what keeps the bucket moving in a circle but not what keeps the water in the bucket.
The way I see it is similar to how I explain a satellite orbiting Earth. It is constantly falling towards Earth under the force of gravity but its horizontal motions effectively means it constantly "misses" the planet, but I can't exactly write that in my exam now can I?
Thanks for your help,
Conor