Damn Physics..
Posted Nov 18, 2011, 7:34 PM UTC
46528
Also, please consider impulse. It's the sudden change in force that will kill you...
12
I think you meant sudden change in momentum.
3
Uh, change in momentum is the impulse, isn't it?
If I recall the impulse-momentum theorem correctly...
2
[deleted]
1
Yes, I do mean sudden change in momentum. Which can be completely described in terms of force. Impulse
1
[deleted]
1
The aren't one in the same. Impulse does not = F[delta]t. Impulse = (sigma)F[delta]t, which means that F = dI/dt. It's not the force that kills you, It's the amount of force you experience during the time you come to a sudden stop... Which is the Impulse.
2
Oops.
2
s'all good.
1
if there ever were a jpg artifact riddled minimalist wallpaper that sorely needed a cleaning-up, it's this one
10
Why does it use a and lower case t in the first equation and then dV/dT and upper case T in the second.
4
[deleted]
1
It's not how far that you fall, it's how you land.
2
Unless h is involved and it happens to equal 0.
2
Hate to be the only idiot in the thread but can someone explain this... I remember that delta is change and I'm assuming that V is velocity but the rest... Anyone?
1
if you hit the ground your change in velocity is very high over a small amount of time making the delta/delta number really large and thus the results is a large force. This force is what gives the splatt not the speed.
3
Knew this from too much time on internet, that the sudden change in speed kablooeys your insides... Nice to know science agrees :)
1
It's the change in momentum (mv) divided by time (t), which in this case gives the impact force.
2
The first equation is supposed to mean "speed".
final speed = initial speed + acceleration * time.
The last equation is Newton's second law and is supposed to mean "the force of the impact".
Force = mass * acceleration
Acceleration = change of speed / change of time or how much the speed changes in an amount of time.
This wallpaper is flawed. The symbol for speed is a lower case v. An upper case V stands for "volume". Also, the 𝛥T in the equation for acceleration should be 𝛥t. An upper case T stands for temperature.
1
[deleted]
1
thank you for reminding me that my professor used to force us to do EVERYTHING in vectors...
1
So glad I decided to take physics this year.
1
[deleted]
1
Where in the world is Vi used for initial velocity instead of u?
-3
Um, every intro to physics class?
7
Wait, according to this, if I jetpacked out of an airplane starting at terminal velocity, my ΔV would = 0, so my F would = 0, so I'd totally be fine?
Wind resistance, man. Terminal velocity fucks this up. a isn't going to be constant unless you're in a vacuum.
-8
Your final speed would not be terminal velocity. It would be zero since you smashed your little brains into the ground. Your ΔV would be terminal velocity - 0, and the force would be very, very large.
8
The f=m*(dv/dt) is the impact you make with the ground
2
[deleted]
You can't explain that.
But I just saw an equation that does.