The physics of huge urban drops to flat?

but if the snow makes your decceleration time go from .001 to .002 then you just halved the force.

regardless, an inch of snow is too soft, and too thin to really help much of anything. thats why you see people build a pile of snow 8+iches and try to pack it down, to make it at least a little resistive.
 
ha, I doubt it would half the impact time. And really if you pack down a large amount of snow how would that help you? That would take away the possibility of the snow spreading hence "decreasing the force". That's why powder landings are so much softer. When compressing snow, you have already applied the force to the snow... when you pack down snow with a shovel, at first it is really soft, and eventually it applies a large amount of force back on the shovel when it is packed solid. What would that end up doing (besides protecting the skis)?
 
the best answer in the thread, which is about how to land... is to bend ur knees, and sit in a chair and flex ur core... whatever is bent most, bends first.. so if ur bent more at the hips then ur knees, u will slam ur chin into ur knees, because your hips will bend first.... if u keep a strong core (flex ur abs) and sit in the chair (bend ur knees)... u'll be able to take large drops dependent upon the strength you have in ur legs... weightroom comes in handy... good luck kid
 
you ever landed anything big onto 5iches of pow ontop of ice or crust? doesnt do much. the softer it is, the deeper you need it.

the softer it is the less force it exerts onto the object per unit length. so it needs to be deeper to exert the same force as some snow that is packed a little bit.

And anything that is handpacked will be no harder than a soft spring day, which is perfect when you only have so much snow you can pile up. No shit you dont want the snow as hard as the pavement below it.
 
You guys are both right. His explanation of landing on more snow is true but the effect is probably negligible with thin layers of soft stuff.

Also, the normal force is exerted on area not length.
 
p.s. i love it when everyone whips out their college level 1 and 2 dicks and flops em on the table. there are so many miniscule factors that go into energy dissipation through the snow, your skis and boots, and the physiology of the human body that NONE of us will ever be able to properly describe it.

hey kid that made the thread; build a little landing, pack it with a shovel, and fucking send it.
 
those would have to push on something to resist you pushing on them. they cant because the only thing they can push against is snow, which in the vertical direction is solid and in the horizantal direction is super slippery.

so what force allows you to then move forward, with more horizontal force than you did before. It would have to be a frictional force, that you pushed against with your legs. And the frictional force between your skis and snow is neglidgable.

Regardles, you would still be absorbing the full force of the vertical vector, and then pushing agaisnt something to generate extra force in the horizontal direction
 
Ok first of all, I really wish I had MS paint so I could illustrate, but a big part of what you aren't getting that I am trying say is that because the impact is spread out over time due to your legs and, because you are going forward, your landing trajectory briefly resembles the motion of a mass rotating around a axis. So, instead of breaking it down into x and y components, you have to take rotational dynamics into account.

Think about a ball on a string attached to an axis. If you release the ball at 90 degrees so that it is dropping straight down then cut the string when the ball gets to the bottom, the ball will continue horizontally, not all energy will just be lost.

 
So, by the way, pushing against the ground, your boots, your skis and moving your body (which obviously creates an opposite force) does the trick.
 
skateboarders/snowboarders/skiiers pumping in the pipe speeds them up because they are pumping (temporarily exerting a greater than normal force) on the part of the pipe that is angled \\\

this causes them to speed up in the horizontal direction because the extra normal force exerted when they pump has a component in the horizontal direction, therefore causing them to accelerate.
 
its a lot easier with full tilts because they use ion technology in their soles to help repel the earths magnetic feilds so it feels like youre going slower when you land, even though youre still going the same hyphy speed
 
That actually makes a lot of sense. However if the landing is horizontal, and the snow is flat ice, speed will make zero difference, because gravitational force and forward speed aren't related.

 
Look at it like a pilot.. The longer you descend into landing is going to lessen your force between the aircraft and the ground.

The quicker you descend is obviously going to put more for force between plane and ground.

In the case of urban drops getting much vertical acceleration isn't going to be easy especially dropping from higher distances. Vertical acceleration would help, but how much would it help? Doubt it would make an amount that your body could even notice.

just my two cents
 
an airplane uses to lift to fight gravity. that analogy is completely useles in this case.

Now, take the wings off the plane, cut the motor, and let it free fall from the sky. now we have a similar situation.
 
damn mobile.. a bullet shot out of a gun opposed to a bullet dropped.. in order to have compare wouldnt you want to shoot a bullet into the ground instead of dropping so the speed of the bullet would be the same?
 
itsmine.jpg


one day.....
 
that analogy went right over your head didnt it? a bullet shot at 1000mph horizontaly(or whatever the speed of a bullet is) will have the same magnitude vertical vector as a bullet that is simply dropped from your hand.

 
no. if a bullet is fired out of a gun horizontally it will hit the ground at the same time as a bullet that is dropped as the horizontal and vertical motion are completely independant of each other and the only vertical forces acting on both the bullets is gravity and both will fall accelerating at 9.8ms^-2
 
after the lengthy discussion of physics i will give you an answer (not entirely accurate as there are too many variables in the conditions of the landing i.e. amount of snow, snow pack, how much you compress and bend, etc.) but assuming you weigh around 70kg and you drop a cliff of 15ft the impact force you will feel is ~20,000N (here's the calculator i used cos i couldn't be assed doing it by hand http://hyperphysics.phy-astr.gsu.edu/hbase/flobi.html ). building "cheesewedges" will help as you will have more snow to slow down the falling spreading the force over a longer time along with the reduction of force due to landing on the angled surface. final question- muscle strength, bending of knees and waist to absorb the forces, and the force being spread over the area of the skis and through the boot materials. /thread(unless somebody disagrees, which undoubtedly someone will)
 
your two cents aren't worth two yen...

vertical acceleration is the same regardless of how high you are dropping from (within a certain distance from earth's surface, in this case its the same because no one is dropping from out of space).

T24's post on the first page was the most accurate/easiest way to explain it. if you're landing on a completely flat surface it won't make a difference, but landing on a wedge changes the normal force, decreasing the amount of force on your legs. legs are weird because its muscles/tendons/bones, they act more like a spring than anything, but the amount of force on your legs is constant regardless of how you land (bending your legs vs keeping them straight), its how you apply that force that changes

to answer the original op even tho its been done various ways, yes a cheese wedge will help, and any amount of snow on top of concrete is better than none. its better to do it on your skis than just on your boots, and "how hard the landing will feel" will depend on your leg strength
 
the balls it takes to do this impress me. that being said id rather watch something with technicality than a high risk factor
 
wrong, jump off of a chair and land with your legs locked and tell me it's the same force as if you jump and let your legs bend.

longer contact time (accomplished by bending your legs) reduces the force required to bring you to a stop
 
thank you, this thread was dildos until this post...

it all makes sense when you consider that an uphill landing would be harder.

But this isn't even a question of physics. go start jumping off things with no landings, you learn how to take big impacts. that's all there is to it. someone telling you over the internet how to take a hit is going to do nothing for your skiing.
 
HELL YEAH! Fuck physics. Steeze actually overrides physics so as long as you are wearing a &xl Ignant, you'll totally be able to pull it off!
 
HELL YEAH! Fuck physics. Steeze actually overrides physics so as long as you are wearing a 7xl Ignant, you'll totally be able to pull it off!
 
cali is the only one who gets it. I hate how everyone on the internet is given equal chance to add their thoughts, some thoughts need to stay thoughts, classical physics isnt an opinion, you cant argue about it, you either know it or you dont.
 
if you are landing on steeper slope, the force of your weight is being exerted in both the x and y direction. This means that the normal force exerted on you by the ground will be much smaller, since it is equal to the y component of your weight. This is the simplest way to explain it. momentum does come into play here, but this explains the basics of what is happening.
 
you didnt read what I posted.

"the amount of force on your legs is constant regardless of how you land...its how you apply that force that changes"

you told me I was wrong and then repeated exactly what I said...the force is the same regardless, its how the force is applied to your body that changes (all at once or dispersed if you bend your legs).

the contact time is the same either way too. like I said before legs act similar to springs, so the more you compress the fall with your legs the less force it'll take to land (the force from the fall on your legs is still the same tho). contact time is no different, its how much the spring (legs) are compressed that makes the difference in what you feel in your legs, as long as the impact force isnt greater than what your legs can handle with the bend

look up hooke's law if you're more interested, because so far you haven't shown any proof of physics education, which is 95% of posts in this thread
 
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