if u jumped up in a quickly descending lift would your head collide with the roof?
113385
Depends on whether the lift has reached its maximum velocity and how good a jumper you are. While the lift is accelerating down, your weight is reduced and hence you would need less jumping energy to jump up to the roof. So your chances of hitting the roof are higher...again, no guarantees since it depends on the lift's acceleration and your jumping ability.
1006314
No.  When you departed the aircraft you body would be travelling at the same speed as the aircraft was travelling.    Wind resistance would slow your body down very quickly but you would still land well ahead of the point in which you jumped out of the plane.
199668
This is analogous to asking if bumping your head on a branch can kill you as you are falling 1000' off of a cliff...\n\nPlease check yourself into a program and throw Tina out...
782997
You've just made my day!\n\nHmmm it depends, is  your helmet made of tinfoil? If it's not then Yes its dangerous to be on the roof without your helmet. Wouldn't want to make a facial imprint in the sidewalk now would you?
965659
you will probably fall over.
598399
Yes.  The full coaster may go down faster, but would lose momentum at the next upswing.  An empty coaster would reach the top of the next hill without the hindrance of gravity.
1150073
That would sort of depend on what you land on, now wouldn't it? If you have a parachute you could jump from the top of the Petronas Towers in Malaysia and survive. I think the farthest a human has fallen accidentally and lived is under fifty feet, unless they just happened to fall into something soft like a snow drift.
308763
that depends on the shape and mass of the body falling, the shape affects air resistance, which determins terminal velocity, if there were no air resistance then terminal velocity would never be reached and it woudl be alot different. the mass matters becaseu the force of gravity, mg, has to equal the force of air restance, which increases with speed, \nant's, who's mass is very small, reach terminal velocity at 3 inches, dropping them from 50 feet is like dropping them from 3 inches, \n\nin most humans' i would say no, but it all depends.
1013783
Absolutely. Surround yourself with people that care and they are sure to catch you every time. Besides......once you learn from your mistakes its amazing to see how one can "bounce" back into good graces. So even then, hitting the ground only stings for a second.....then you are off and running and soaring higher than ever.
119853
Because if we sit down on it in the middle of the nite we fall in!!!  if you dont pick it up in the middle of the nite what happens? nothing other than we sit on droplets!!  its a no win.. except i hate to fall in lmao
347023
If you jump, you will be moving at the same speed as the vehicle just before you left the floor.\n\nWhen in the air, if the vehicle is accelerating, the vehicle will move forward faster than you and consequently, you will land some distance from where you jumped and vice versa.\n\nIf on the other hand, the vehicle was not accelerating, you will land at the exact place you jumped from. Of course, this is not counting air resistance.
1110379
You'd probably be killed by either one. A ton of anything falling on you would not be a good thing. However, if I absolutely had to choose one, I'd choose the feathers and hope that they were dropped from a great height. That way, maybe the air resistance would slow them down and scatter them enough that I wouldn't be hurt.
1125451
Nope, I side stepped it,then picked it up so you wouldn't hurt yourself : )
960647
Okay so if you are falling towards the ground the problem is that you are going to have a lot of speed when you hit the ground and that's not a good thing at all.  It is true that you can use your legs to push yourself upwards.  If you could push yourself upwards enough you could reduce your velocity towards the ground or even cancel it out!  So the question is how much upwards velocity can you give yourself by jumping.\n\nSo a little background first.  Say a slingshot fires a ball at 50 m/s.  If you were falling straight down towards the ground at 40 m/s and you shot the ball straight up it would have a velocity of 10 m/s upwards.  How did I get that? I got it because you can just add and subtract velocities like that if they are in the exact same direction (or exactly opposite direction).  I walk left at 5m/s along the ground and throw a ball same way at 6m/s it is then going left at 5ms+6m/s.  Or if I threw it right at 6m/s while walking left it would start with a velocity of (5m/s-6m/s) left which is -1m/s left (that's the exact same thing as 1m/s right).\n\nYou can figure out how much upwards velocity you can give yourself by jumping using this formula:\n\nvf²=vi²+2ad\n\nvf = final velocity, vi = initial velocity, a=acceleration, d=distance\n\nImagine you're standing on the ground while we think about this for a second and that you are great at jumping and you can jump 1 meter upwards.  You start with some velocity vi from your jump and have 0 velocity when you hit the peak of your jump at 1 meter in the air.\n\n0=vi²+2(9.8)(1)\n\nvi=4.4m/s\n\nSo if you are a strong jumper you can give yourself an upwards velocity of 4.4m/s.\n\nNow finally back to the elevator, if you and the elevator fell from a 5th floor at about 15m height you would be going down pretty quickly, almost 20m/s before you hit the ground.\n\nNow if you could jump upwards JUST before hitting the ground you might at best get almost 4.4m/s of upwards velocity and you could subtract that from your downards velocity of 20m/s.  That gives about 15m/s and that is a big problem to hit the ground at that speed.\n\nUnfortunately you wouldn't even do that well because not all of the force you applied to jump upwards would go into accelerating you upwards.  Some of it would go into pushing the elevator downwards even faster so you would gain even less upwards velocity.\n\nThe short answer is you could reduce your speed a little bit but not nearly enough to stop yourself from landing way too hard.
668999
I would probably be too busy trying to grow wings, trying to make a drag chute out of my clothes, or aiming for a barn with a hayloft (like in a 3 Stooges bit).  \n\nEither that, or I'd be focused on making myself into as aerodynamic a form as possible for the purpose of making my impact occur head first at the highest possible velocity.\n\nIf you have enough freefall, and you maintain your body in a streamlined head-first attitude with arms flat at your sides and legs tightly together -- so that your body is like a dart streaming throught the air -- you could reach a terminal velocity from 124mph to more than 200mph, depending on your body mass and your skill.\n\nOf course, if you jumped from over 100,000 feet like John Kittinger did, you could break the sound barrier!  He did, at speeds of 714mph in the upper stratosphere.\n\nEven after deploying his drag chute, he rocketed through the stratosphere and at speeds in excess of 600mph.\n\nIf his braking and main chutes had both failed, he could have set the record for the deepest "man-made" impact crater.\n\n\nFor more about record breaking skydiver Kittinger, go to\n\nhttp://www.wpafb.af.mil/museum/eagles/kittnger.htm\n\n\nAs a kid I was fascinated by stories of people who survived things that would have usually killed anyone.  For instance, there have been persons who plummeted from great heights and walked away -- like a USAF pilot whose chute failed.  He plummeted thousands of feet and impacted on a hardened concrete runway.  He walked away with a broken nose, and left a small crack in the concrete.\n\nI don't recall reading what went through his mind, but I can surmise what went through his trousers!!!
1182159
Fast enough to break important parts of your anatomy if you were to fall off.
950064
Yes in the center the gravitational pull would be equal from all sides, freefall!