A pail filled with water of mass m is whirled in a vertical circle of radius , r . When the pail is at its highest point , its speed is v and the normal reaction of the pail on the water is R . Water does not fall out because ??
i know i am supposed to this :
It is because the centripetal force is greater than the gravitational acceleration ??If that's the case , water would spill up since F is downwards .
Why R+mg ?? When i draw the diagram , my R is pointing upwards and mg is pointing downwards and if the acceleration is downwards , shouldn't it be mg-R=ma ??
And why must R be greater than 0 and not other values ??
I really appreciate ur effort to explain this to me .
If R is downwards , then the forces are not balanced .. there is no force to balance mg . ??
From what i understand , if there is a book on the table , mg is acting on it downwards so there is also another force which is R acting on it upwards ..
But if both forces are downwards , which is also my doubt , then is it against newton's 3rd law ?