- #1
tomo
- 3
- 0
Hey, I'm an adult who finally realized that physics is great and tries to recall (or rather learn for the first time) what he learned at the school. I've been reading some basic things around. It's not really a homework question, I'm just trying to understand the laws here.
1. I know that if a car drives in a circle with a steady velocity, it accelerates towards the center of the circle. For some reason I can't understand the thing about the acceleration, I mean it is still driving with a steady velocity, so where is the acceleration? Doesn't the acceleration imply that it'd speed up? And why is the acceleration always 90 degrees from the velocity direction? Why not 45 degrees or some other number?
2. Newton's first: as I understand, if I drop a lemon on the table, since the force it encounters is balanced, it (the lemon) still moves in a straight line with a steady velocity...? It's very counter intuitive... does my lemon come to the rest, or is it still moving? And then when I think of the relativity, Newton said that if an object is at rest it will stay at rest, but is there anything in the universe that actually is at rest? Is my lemon at rest in relation to the earth, or is it still moving? It freaks me out...
Thanks in advance and sorry if I posted it in the wrong place...
All the best,
Tomo
1. I know that if a car drives in a circle with a steady velocity, it accelerates towards the center of the circle. For some reason I can't understand the thing about the acceleration, I mean it is still driving with a steady velocity, so where is the acceleration? Doesn't the acceleration imply that it'd speed up? And why is the acceleration always 90 degrees from the velocity direction? Why not 45 degrees or some other number?
2. Newton's first: as I understand, if I drop a lemon on the table, since the force it encounters is balanced, it (the lemon) still moves in a straight line with a steady velocity...? It's very counter intuitive... does my lemon come to the rest, or is it still moving? And then when I think of the relativity, Newton said that if an object is at rest it will stay at rest, but is there anything in the universe that actually is at rest? Is my lemon at rest in relation to the earth, or is it still moving? It freaks me out...
Thanks in advance and sorry if I posted it in the wrong place...
All the best,
Tomo