Quote (Wyrmvater @ Nov 2 2016 03:26pm)

gravity definitely does exist, it is called attraction of mass, the moon hovers around the planet because of gravity, mass attraction, I can't believe you actually theorize on disproving gravity.



bottom of the fraction is zero? You mean divided by zero? rofl

by convention if an exponent is zero then it equals 1.




and acceleration by definition is an increase in speed, things aren't accelerating if they're going at a constant speed... wtf is this thread about?

Quote (Santara @ Nov 2 2016 12:36pm)

Not in physics. Acceleration is a change in velocity, so acceleration can mean slowing down and changing direction also. See post #456.

Quote (Wyrmvater @ Nov 2 2016 09:26am)

gravity definitely does exist, it is called attraction of mass, the moon hovers around the planet because of gravity, mass attraction, I can't believe you actually theorize on disproving gravity.



bottom of the fraction is zero? You mean divided by zero? rofl

by convention if an exponent is zero then it equals 1.




and acceleration by definition is an increase in speed, things aren't accelerating if they're going at a constant speed... wtf is this thread about?



Ok I read a bit about it, but still, the Earth's velocity, if you equate some sort of spherical motion velocity, does not change, or it is very minimal, or we would have collided with another planetary body years ago.

The vector is very near constant, if you know how to equate a circular vector, which must be complex physics.

Quote (Wyrmvater @ Nov 2 2016 03:43pm)

Ok that makes sense, but with a constant force on the object, as in a circular "vector", wouldn't it be the same force as no vector change, speed going in a straight line? Because technically if something is experiencing speed, it does experience a force, the one that is propelling it.


how could something accelerate over zero time? m/s2 is in the equation, a simple change in velocity without a time needed to experience the change would not be acceleration, as far as I know.

I'm no physicist, just going a partir de ma raison

Quote (balrog66 @ Nov 2 2016 12:53pm)

How can there change without time passing? 0s means nothing changes.

With a constant force applied there will be a constant acceleration. Maintaining a speed means there are no net forces acting on it. Let's say you are driving in a car at speed x in a straight line. The forces acting against your movement (tire friction, aerodynamical friction, etc) will be cancelled out by the forces propelling you forward (momentum applied to the wheels by the engine). Normal and gravitational forces also cancel.

If you are in a vacuum traveling at speed x in a straight line, it will without failing keep moving in that direction at speed x. Changing that speed (or the direction of movement) will require a force acting on you.

Quote (russian @ Nov 2 2016 05:58pm)

You know, none of this matters. Whether 0 acceleration can still be considered acceleration or not is irrelevant. The fact remains, that for us to experience a downward force the Earth cannot be moving up at a constant speed. If it did, objects would not fall.

Quote (Wyrmvater @ Nov 2 2016 09:07am)

Right, but if it's a constant "directional" vector, as in spherical, the orbit of the Earth around the sun, then ofcourse there is a force acting on it, the sun's gravity and the "initial" speed that first propelled it, whether this is still a force or not I don't know. If you're in a vacuum and you move, that means you were "pushed" by something with force earlier on.


A constant force being acted upon the Earth, the sun's gravity, how would you call it the Earth accelerating? If it's going at the same speed and has the same force applied to it constantly. Ignoring the fact that it's not perfectly helical and is most likely accelerating per se on it's way to the shorter half of the oval, or something of the genre.