acceleration is a calculation with the time on the bottom of the fraction right?

what happens when the bottom of the fraction equals zero?

does a portal open up to the lost lands beyond the arctic wall if you figure out how to divide by zero?



wow that's a fucking gem.

This post was edited by thesnipa on Nov 2 2016 06:20am

i'll admit i'm not up to scratch on my physics, did i misunderstand the conversation?

aren't we talking about acceleration? which has the denominator value set as time, so on an acceleration calculation of zero time the bottom part of the equation which is divided by equals zero?

TBH i'm just skimming and noticed tard keeps arguing for zero time.

When you need it over an infinitesimally small amount of time you take the derivative which is actually taking a limit as the bottom goes to zero. This is how you would get an instantaneous velocity 4 a system whose velocity is constantly changing.

This post was edited by Thor123422 on Nov 2 2016 08:32am

Just had these experimental setups used by students this week. Nice floating ping pong ball huh?

So as card_sultan knows, F = m*a. Our students were able to calculate the Electromagnetic force by using several measurement points of y (distance between magnet and top of ball) and a first grade Taylor expansion of Fm = (c_m*I + p_m)((a-d)-y), Where Fm is the electromagnetic force, c_m is the magnetization component of the iron core, I is the current, p_m is the magnetization of the permanent magnet in the ball, a is the distance between the bottom of the magnet core and the bottom of the setup and d the diameter of the ball.

By equaling m*g (yeah that silly gravitational force!) with Fm, nearly all students were able to successfully levitate this magnetized ping pong ball with a simple feedback controller designed in MATLAB.

So how do you explain that using the concept of gravitational force will actually make your experiments work?

Actually, that's you. To wit:



Velocity is both speed AND direction. So travel around a circle at constant speed IS experiencing acceleration, because the velocity changes. Travel in a straight line at constant speed is NOT experiencing acceleration. To change direction, you must have force, which means acceleration.

Put to you another way, (and for the purpose of this demonstration, we'll pretend there's no such thing as wind resistance or friction to impede you) you're driving down a flat, straight road at 60 mph on cruise control. You have momentum and you have velocity. You do not have acceleration until you enter a curve, whereby you turn the steering wheel and experience your momentum attempt to continue carrying you in the straight line path you were on, and only experience a force (an acceleration) because your steering tires have exerted a lateral force against the roadway to turn the car along the curve.

I'll go back and repost the definition of acceleration (in physics) because you clearly missed where they said CHANGE.



Changing your velocity by changing direction is, by definition, acceleration, even if your SPEED remains unchanged.

This post was edited by Santara on Nov 2 2016 09:00am

The unit of acceleration is a fraction with time at the bottom, because you multiply it by time to get to a speed.

For instance, a certain object's acceleration is 10 m/(s^2). If you want to know its speed after 5 seconds, you do the following (granted that its initial speed is 0m/s):


The value time never actually ends up as the bottom part of the fraction. It is simply noted like that because it allows you to multiply acceleration by time properly.

It is easier to understand if you read it out loud, and say "per" where you see the "/". The unit of speed then becomes "meters per second"; the unit of acceleration becomes "meters per second per second".

Take this example: Your car is driving 100 miles per hour (notated as 100m/h). How many miles does your car drive in 0 hours?

This post was edited by Leevee on Nov 2 2016 09:20am

i now understand, i entirely misunderstood the conversation lol.

well card you win this battle, we'll see how the war shakes out.

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.

This post was edited by Wyrmvater on Nov 2 2016 09:37am

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