#1

hey guys i was just wondering if anyone knew if u increase speed when u skydive or if u stay at a constant speed the whole time.. for example would u be at the same speed after free falling 5 seconds apposed to 60 seconds? Its random but it got me thinking and i have no idea as i never did physics at school.. anyone know what would happen?

#2

falling objects accelerate in earths gravity at 9.something meters per second.

#3

You'll max out at a terminal velocity based on your mass IIRC

also, obligatory google.com

also, obligatory google.com

#4

You would fall exponentially faster until you reached terminal velocity (the speed at which gravity pulls you to the earth).

...I think. I didn't take physics either.

...I think. I didn't take physics either.

#5

you speed up slowly until you reach "terminal velocity" which depends on the air resistance

off the top of my head, I think terminal velocity for a human is around 200mph

off the top of my head, I think terminal velocity for a human is around 200mph

#6

awsumm.. thx guys

#7

it depends. if you body is streamlined, you would fall faster. but if you spread your arms and legs, you'd fall slower. im not very good with physics partially because im not there yet in science but it all depends

#8

falling objects accelerate in earths gravity at 9.something meters per second.

9.8

#9

9.8

You will accelerate 9.8 m/s^2 per kg of mass.

#10

yeah gravity pulls at 9.81 meters per second squared, and you would soon reach your terminal velocity and remain there.

#11

You will accelerate 9.8 m/s^2 per kg of mass.

yes

#12

You will accelerate 9.8 m/s^2 per kg of mass.

Wrong, you will accelerate at that rate, regardless of your mass.

And you will reach a terminal velocity which occurs when the force of gravity equals the drag (air resistance), thus putting your body in dynamic equilibrium and no longer accelerating.

And just to settle any disputes about acceleration being independent from the mass...

In physics, gravitational acceleration is the acceleration of an object caused by the force of gravity from another object. In the absence of any other forces, any object will accelerate in a gravitational field at the same rate, regardless of the mass of the object. On the surface of the Earth, all objects fall with an acceleration of somewhere between 9.78 and 9.82 m/s² depending on latitude

*Last edited by bigwilly at Mar 23, 2009,*

#13

You will accelerate 9.8 m/s^2 per kg of mass.

big ****ing fail

you accelerate at 9.8 m/s^2 no matter what your mass is

terminal velocity is all about air resistance, it's a matter of surface area, not mass

all mass does is determine how much force your body has when it hits the ground(f=ma)

edit: my bad, I didn't see I was beaten to calling him out on it

#14

Wrong, you will accelerate at that rate, regardless of your mass.

And you will reach a terminal velocity which occurs when the force of gravity equals the drag (air resistance), thus putting your body in dynamic equilibrium and no longer accelerating.

right.

it's your kinetic energy that is dependent on mass.

#15

Wrong, you will accelerate at that rate, regardless of your mass.

You're right. I was thinking of net force. Fnet = ma. Since this is a "free fall" (technically not a free fall as there would be air resistance), we're only dealing with the acceleration of gravity.

If my mass is 80 kg, the net force (Fnet) down would be 9.8 x 80 = 784 N.

My mistake.

*Last edited by ttreat31 at Mar 23, 2009,*

#16

Using a lower level derivation (there are more complex and accurate ways to determine this),

Terminal Velocity is sqrt(4mg/A)<---- Note: A = surface area, m = mass in kg, and g = 9.8 m/s/s

Terminal Velocity is sqrt(4mg/A)<---- Note: A = surface area, m = mass in kg, and g = 9.8 m/s/s

#17

right.Originally Posted by bigwilly

Wrong, you will accelerate at that rate, regardless of your mass. And you will reach a terminal velocity which occurs when the force of gravity equals the drag (air resistance), thus putting your body in dynamic equilibrium and no longer accelerating.

it's your kinetic energy that is dependent on mass.

That^ So you can't give a set speed for a skydiver, as you'll fall faster if you make you're body more streamline.

*Last edited by speeddemon93 at Mar 23, 2009,*

#18

You would accelerate at 9.81m/s/s until the the net force acting on you is 0 N, this is when the forces trying to slow you down are equal to the acceleration due to gravity.

#19

you will fall until air friction slows you down, and will fall a constant pace