adminJust thinking about rain
When it rains
1. Will a rain drop’s velocity keeps on increasing due to gravity till it reaches ground?
2. Will rain drop reach a constant velocity (terminal velocity) and hits ground with a constant velocity?
Actually i know when you drop a sinking object in water it will reach a terminal velocity, this is for liquids
but how about a object in air will it reach terminal velocity or the velocity keeps on increasing?
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Sunday, January 20th, 2008 at 8:17 am
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January 20th, 2008 at 8:19 am
In order to test your questions properly, you have to conduct it in an environment free of interrupting factors. You have to isolate it to one thing - gravity. All kinds of occurances can skew your results if you do it “outside” (like wind and air currents, air pockets and bubbles; debris (friction); unseen things like natural gases, and pulses - magnetic or otherwise - which may react with the elements in your sample; the purity of your sample… etc.). Once you sterilize your experimental environment against inhibitors, then you can be about your way proving, disproving, or discovering the answers to your question.
January 20th, 2008 at 8:46 am
There is terminal velocity when things fall (outside water). So the rain will reach a terminal velocity and hit the ground at the same velocity.
January 20th, 2008 at 8:48 am
Without the air resistance :
E(kinetic) + E(gravitational potential) = constant = 1/2.m.v² + m.g.h
So if h decrease then v increase, so v won’t stop increasing untill the rain touch the ground.
With the air resistance yes there is is limitation of speed.
I found this, it answers everything :
http://en.wikipedia.org/wiki/Free-fall
January 20th, 2008 at 8:52 am
In real life, not really possible. Theres gonna be wind so the rain will have sideways velocity as well as downwards. You also have pockets where air is less dense and more dense (affecting terminal velocity), and currents that increase and decrease the acceleration on the rain drop. Drop it in a tank with no circulation. And yes it will.
January 20th, 2008 at 8:53 am
for the first answer - NO, if it was vaccum then yes. In air the aceleration is not 9.8 m/s . It depends on the amount of air density it croses per m(cube). Also it depends on the kind of objects it hits. The size of the hetrogenous objects like smoke, dust , e.t.c will be responsible for the acceleration.
January 20th, 2008 at 8:54 am
It’s dynamic