- #1
sameeralord
- 662
- 3
Hello everyone,
Ok I thought I knew gravity and just realized I absolutely have a very poor understanding about it.
Ok let's say a person was moving in a lift
1. The blood would pool around the legs because of gravity, but my question is aren't we overcoming the gravity force to go up, why would it affect us? Ok the explanation is that upward force from the lift is not acting on the body. But if we are moving up how come it doesn't affect us.
2. Ok what about lift moving down, why don't we feel any weight? Ok the explanation is we are moving with gravity, but if the lift is not accelerating at 9.8 ms2 we should feel the gravity right.
3. About basic free fall without a lift?
Ok now we are accelerating because of gravity, but why don't we feel the force. Aren't we accelerated down because of that force, why don't we feel it. I basically don't understand the difference between force and acceleration and how one can exist without other
4. Why do we feel weight because of normal reaction force?
It is the force of body on the earth. So how come we need a normal reaction force to feel the gravity. I can understand how staying still would make you feel gravity but what does normal reaction force have to do with it.
5. What is gravity?
How is there an acceleration without a force. I know this is a big question but just give me a simple explanation, I have a long way to go before I want to really know the answer for this.
Thank you so much for anyone who is going to take their time and help me. It would certainly do my physics a world of good. Thanks
Ok I thought I knew gravity and just realized I absolutely have a very poor understanding about it.
Ok let's say a person was moving in a lift
1. The blood would pool around the legs because of gravity, but my question is aren't we overcoming the gravity force to go up, why would it affect us? Ok the explanation is that upward force from the lift is not acting on the body. But if we are moving up how come it doesn't affect us.
2. Ok what about lift moving down, why don't we feel any weight? Ok the explanation is we are moving with gravity, but if the lift is not accelerating at 9.8 ms2 we should feel the gravity right.
3. About basic free fall without a lift?
Ok now we are accelerating because of gravity, but why don't we feel the force. Aren't we accelerated down because of that force, why don't we feel it. I basically don't understand the difference between force and acceleration and how one can exist without other
4. Why do we feel weight because of normal reaction force?
It is the force of body on the earth. So how come we need a normal reaction force to feel the gravity. I can understand how staying still would make you feel gravity but what does normal reaction force have to do with it.
5. What is gravity?
How is there an acceleration without a force. I know this is a big question but just give me a simple explanation, I have a long way to go before I want to really know the answer for this.
Thank you so much for anyone who is going to take their time and help me. It would certainly do my physics a world of good. Thanks