. . . Acceleration is 9.81 meters/second squared. That means that force you'll create falling through the air is less than 900 newtons, so your caribeaner thats rated for 25000 newtons would surely hold you. And that's pretty much all you need to know.

I don't want to know about mass, gravity and lifting, just a a quick convert factor into app. lbs. of strength. thanks

The short answer is that a Kn is 224 lbs.

The long answer is that they are not the same. One cannot say that I don't want to know about baking I just want to know how many brownies in a piece of cake. A kilo newton is a measure of force applied, a lb is a measure of mass. An item such as a biner can hold a certain amount of mass in a static condition (10 Kn is roughly 2250 lbs) but a weight in motion would break that same biner (a 1000lb weight moving at 30 miles per hour from a short fall).

It would be good to understand the differences and as you progress as a climber one should understand just how those changes occur.

So if you weighed 200 pounds, that means your mass is about 90 kilograms. Acceleration is 9.81 meters/second squared. That means that force you'll create falling through the air is less than 900 newtons, so your caribeaner thats rated for 25000 newtons would surely hold you.

A newton is unit of force, metric style. There's an equation out there, developed by Sir Isaac Newton, which says force is equal to mass times acceleration. So if you weighed 200 pounds, that means your mass is about 90 kilograms. Acceleration is 9.81 meters/second squared. That means that force you'll create falling through the air is less than 900 newtons, so your caribeaner thats rated for 25000 newtons would surely hold you. And that's pretty much all you need to know.

What is a Newton?

So if you weighed 200 pounds, that means your mass is about 90 kilograms. Acceleration is 9.81 meters/second squared. That means that force you'll create falling through the air is less than 900 newtons, so your caribeaner thats rated for 25000 newtons would surely hold you.

close, but not quite. Whenever anyone says "pounds" they mean "pounds force" There is a such thing as "pounds mass" but nobody in their right mind would use that unit, it's just too confusing. Use slugs intead. 1 slug is equal to 32.2 pounds mass.

:lol: :lol: :lol: You are exactly right. I just could not quite bring myself considering the question to tell the nice person that we were going to introduce slugs into the equation. Like maybe I should use a simple term to reinforce that the force was different from the force.

they are not cookies, they are fruit and cake.

Ummm . . . no. My physics is pretty rusty by I know you can't just multiply 90 kg by 9.8 and says that's the force.

Ummm . . . yeah. My physics is pretty rusty too, but I do remember that:

F= force = ?
m= mass = 90kilograms
a= acceleration = distance/time squared = 9.81 meters/second squared at sea level

Therefore, F=m*a = 90 x 9.81.

That´s force.

Ummm . . . yeah. My physics is pretty rusty too, but I do remember that:

F= force = ?
m= mass = 90kilograms
a= acceleration = distance/time squared = 9.81 meters/second squared at sea level

Therefore, F=m*a = 90 x 9.81.

That´s force.

Also, I'm sorry if any of the above is incorrect. It's been a long time since I've been in a physics class.

This natural cubit measures 24 digits or 6 palms or 1½ foot. This is about 45 cm or 18 inches.

If you're on the moon, your pound "weight" will be different than it is on earth (force changes when gravity changes). Your mass is the same on earth as it is on the moon. So, your weight in slugs (or, even better, grams) will remain the same.

Crystal clear! :roll: Little gems like this really help to clarify things.

Weight is a force measured in Newtons, mass is a proprty of a body measured in kg. The two are related through Newton's 2nd law, F = ma. A slug is a gastropod and a pound is a unit of currency!

Also, this is the net force applied in arresting your fall. The max. force applied at any one time during the deceleration of the body would be much less.

Since you assume a linear deceleration your force of 1333.4 N is a constant and applied over the time interval of 0.5 s. In reality the deceleration force is a function of time.

Since you assume a linear deceleration your force of 1333.4 N is a constant and applied over the time interval of 0.5 s. In reality the deceleration force is a function of time.

Or distance.

Curt

I am definitely jumping on the 'you have no idea what you are talking about' band wagon!!
As curt was hinting at.....
'a', as in acceleration (distance/time^2), is NOT gravity (9.81m/s^2, what you are assuming) when you are talking about catching a falling climber :!: :!:
It is the decceleration caused by the rope catching you (or if you will, NEGATIVE acceleration).
If you are are 80kg, and travelling at 9.8m/s (you have been falling for 1 second), and the rope catches you.......... (assume it takes 1/2second for you to come to rest): F = 80kg x (-)19.62m/s^2 = 1569.6N = ~1.6kN

Very rough calculation, please someone correct me if I am wrong!
The time to come to rest was a complete guess, I have no idea how long it would take (it would have a lot to do with the rope, I think).

Dude, simple, is mass x acceleration = to force? Yes? I never mentioned anything about a falling climber. I was just saying it is force.
:roll:

Let's say it can exert a constant 700 N of force.

However, using the equation I used before, I will end up with a net force exerted that is larger than 700 N

To say that an object with a mass of 980 Newtons weighs 100 kg is true iff that object is at rest on Earth's surface.

Another example is to say that an astronaut can step on a scale here on Earth where gravity is 9.8 m/s^2 and weighs 98 kg. That same astronaut with the same mass stepping on the same scale on the Earth's moon where gravity is 1.6 m/s^2 would weigh only 16 kg.

...

To say that an object with a mass of 980 Newtons weighs 100 kg is true iff that object is at rest on Earth's surface.

Another example is to say that an astronaut can step on a scale here on Earth where gravity is 9.8 m/s^2 and weighs 98 kg. That same astronaut with the same mass stepping on the same scale on the Earth's moon where gravity is 1.6 m/s^2 would weigh only 16 kg.

Now, let's use an example of a shotgun slug (since someone decided to bring slugs into this). If I removed a slug from the round and tossed it to you, it wouldn't hurt. It wouldn't pass through your hand or do any other damage to you. If I throw it at you really hard, it might sting a bit. Now, if I shoot at at you and you try and catch it, it's going to hurt. A lot. Why? The slug still has the same mass in all three examples. The outcome is different in all three because, as stated before, F = ma. That is, Force is equal to mass times acceleration. A bullet is constantly accelerating as it leaves the barrel of the gun, it's just not accelerating at a constant rate, until it comes to rest by striking something.

Do they just not teach you about the metric system over there? Please stop this. It is making me cry! :(

I fail to see what's wrong with what you quoted me on. Just how is it that 100 kg * 9.8 isn't equal to 980?

Nor do I see where the second part of what you quoted me is wrong on either.

Mass is measured in grams, not Newtons. So, if something has a mass of 98 kg on the earth, it has a mass of 98kg on the moon, or in space, or wherever. It's the 980 newtons of FORCE that changes.

A bullet, at least in a vacuum, does not accelerate in the x direction after it leaves the barrel. If not in a vacuum, it accelerates negatively (or decelerates) due to wind resistence. When it comes to a stop by striking something, it does not exert a force of F=ma upon that object. It actually exerts a force equal to the change in momentum over time caused by the striking of the object.

If it were true that it exerts a force of F=ma, then it wouldn't matter how far a climber falls before her fall is arrested, she will still exert the same force. This isn't the case.

Do they just not teach you about the metric system over there? Please stop this. It is making me cry! :(

I fail to see what's wrong with what you quoted me on. Just how is it that 100 kg * 9.8 isn't equal to 980?

Nor do I see where the second part of what you quoted me is wrong on either.

Dude, simple, is mass x acceleration = to force? Yes? I never mentioned anything about a falling climber. I was just saying it is force.

:roll:

. . . Acceleration is 9.81 meters/second squared. That means that force you'll create falling through the air is less than 900 newtons, so your caribeaner thats rated for 25000 newtons would surely hold you. And that's pretty much all you need to know.

for the record:

which is NOT correct. As previously stated, m*g is the force due to an object at rest.

1KN=1000N=101.9716KG

Mods please lock this thread before my head explodes!

The Newton (aka Fig Roll in Europe) is a soft, cake-like cookie (biscuit) filled with fig jam. A patented and trademarked product of Nabisco, Fig Newtons originated in the United States and have since spread across the world. They have traditionally been rather unique compared to similar products offered by competitors, but in recent times rivals have arisen, such as Wal-Mart's "Fig Bars", which are sold under its Great Value brand.

The Fig Newton was created in 1891 by Charles M. Roser of the Kennedy Biscuit Company, a Massachusetts-based bakery. The company named many of their products after surrounding communities. The Fig Newton was named after nearby Newton, Massachusetts. It was first simply called the Newton, but the name was changed to Fig Newton in 1898.

The Kennedy Biscuit Company merged with other regional bakeries in 1898 to form the National Biscuit Company, which later became Nabisco. The cookie is now produced by Nabisco.

The machine that makes the cookie consists of a funnel within a funnel. The inner funnel contains the filling, and the outer funnel contains the dough. The machine expresses a long length of filled cookie, which is then baked, cut into smaller pieces, and packaged.

If it were true that it exerts a force of F=ma, then it wouldn't matter how far a climber falls before her fall is arrested, she will still exert the same force. This isn't the case.

once again we are confusing the acceleration downward due to gravity with the acceleration upward due to the rope arresting your fall. F=ma works perfectly for a falling climber as long as you know what "a" is.

No, they do. It's just that there are retards everywhere.

Curt

No, they do. It's just that there are retards everywhere.

Curt

A newton is unit of force, metric style. There's an equation out there, developed by Sir Isaac Newton, which says force is equal to mass times acceleration. So if you weighed 200 pounds, that means your mass is about 90 kilograms. Acceleration is 9.81 meters/second squared. That means that force you'll create falling through the air is less than 900 newtons, so your caribeaner thats rated for 25000 newtons would surely hold you. And that's pretty much all you need to know.

A Cubit is marked on every tape measure at 19 3/16 inches.

A Cubit is marked on every tape measure at 19 3/16 inches.