- #1
Victorian91
- 18
- 0
First of all,
the situation is as follows :
A girl is swinging a bucket filled with water, and she is whirling it around in a vertical motion.
When the bucket is at any other position on the circumference of the circle, everything seems fine and intuitive.
But an interesting thing happens when the bucket is at the top of the circle.
Newton's Third Law implies an equal an opposite reaction due a push or pull.
At the top, force due to gravity is pointing downwards.
But what then causes the Reaction force?
Since nothing is pushing it, where is the cause of it?
It makes me wonder, if we then increased the angular velocity of the bucket,
I understand that we need an extra force towards the center of the circle in order to compensate for the extra centripetal force. So the reaction on the water due to the bucket becomes larger.
What if i tried to explain this using perceived gravity.
So at the top of the circle, the water perceived gravity as pointing upwards, hence the water will ' BELIEVE ' that the gravity is pointing downwards relative to it and hence will not fall. If that is the case, then it only makes perfect sense to me that the reaction force, now is due to the perceived gravity.
But is perceived gravity a force, or just what we actually perceive?
So, to sum everything up, I am confuse about this problem, Can somebody explain what causes the reaction force on the water due to the bucket?
Many thanks in advance...
the situation is as follows :
A girl is swinging a bucket filled with water, and she is whirling it around in a vertical motion.
When the bucket is at any other position on the circumference of the circle, everything seems fine and intuitive.
But an interesting thing happens when the bucket is at the top of the circle.
Newton's Third Law implies an equal an opposite reaction due a push or pull.
At the top, force due to gravity is pointing downwards.
But what then causes the Reaction force?
Since nothing is pushing it, where is the cause of it?
It makes me wonder, if we then increased the angular velocity of the bucket,
I understand that we need an extra force towards the center of the circle in order to compensate for the extra centripetal force. So the reaction on the water due to the bucket becomes larger.
What if i tried to explain this using perceived gravity.
So at the top of the circle, the water perceived gravity as pointing upwards, hence the water will ' BELIEVE ' that the gravity is pointing downwards relative to it and hence will not fall. If that is the case, then it only makes perfect sense to me that the reaction force, now is due to the perceived gravity.
But is perceived gravity a force, or just what we actually perceive?
So, to sum everything up, I am confuse about this problem, Can somebody explain what causes the reaction force on the water due to the bucket?
Many thanks in advance...