Environmental Applications of Newton's Third Law

[babuloseo]

Ah hi there, I would just like to know the environmental applications of Newton's third law?

Also fnet= 0; how does an object have constant velocity, is it 0? that's why its constant since its acceleration is 0??

please, I am new.. to physics.. and this forumz.

 

[thepatient]

Welcome :].Acceleration is the first time derivative of velocity, so you can say that:

a = 0
dv/dt = 0

Integrating this would get you that:

v = c Velocity is some constant value. Could also be zero if at rest.

So when you have that acceleration is zero, you can either have constant velocity or an object at rest.

 

[babuloseo]

Welcome :].


Acceleration is the first time derivative of velocity, so you can say that:

a = 0
dv/dt = 0

Integrating this would get you that:

v = c Velocity is some constant value. Could also be zero if at rest.

So when you have that acceleration is zero, you can either have constant velocity or an object at rest.

Oh thanks, that makes me eased up at the concept, now I can finish my homework with no head ache :)

But I still need to know the environmental applications of Newtons Laws, can't think and its 1am.. any further help will be appreciated :)

 

[thepatient]

Another way you can see it is that acceleration is the change in velocity over a certain period of time. If you have that your velocity is zero at time one, and zero velocity at time two, then the change in velocity is zero, or acceleration is zero.

a = ∆v/∆t = (vf - vi)/(tf - ti) = (0-0)/(t2 -t1) = 0

 

[thepatient]

Structures of course. You want net forces to equal zero on any structure in order to not accelerate on their own. XD

 

[babuloseo]

Yeah, that's for the second law of Newtons >.<, and maybe the first one.. But what about the third.. I only keep thinking of propulsion systems.. how does helicopteres throw water down or whatever chemicals to help stop forest fires?

I need to know the technological, environmental, social (got it already) applications of Newtons first,second, and third law (finished third law).