Another question - Air Jackets?

My car makes a terrible beeping if you put the key in the ignition
before you fasten the seatbelt. Don't they know that you have to get
your keys out of your hand before you can fiddle with the seatbelt?
Fortunately there's not too much fiddling about under the seat to
disconnect the plug in the seatbelt warning circuit.

Nev..

 

Best I can come up with is
Shit lets bag

Seat secure
Helmet on
Ignition on
Tie-downs checked

Locks on disks
Engine start
Tune sound system (autocom plugged in)
Side Stand

Buttons and Zips
Air bag attached
Gloves on

Sooo...
Do I get a job in the Public Service as an acronym inventor ?

 

The inertia you have when you have dismounted and are walking away.

Are you still trying to find room 302, or are you just dense?

Force required to pull the trigger on a standard handgun is 3kg, and that's
not hard to do. Your analogy of dragging a weight of the same amount is a
brick on a string. A brick weighs three kg.

Theo

 

3kg ?
mine must be soft then going off at 900 gms

 

I can't work out the first bit either. 30kg suspended from a point
applies 30 x 9.81N to the point = 294N or approximately 0.3kN. The
length of the bit of string supporting the weight is irrelevant. Unless
he is saying that the 30kg weight, falling 600mm, exerts additional
force on the point because of its velocity.

 

Yeah, but most of the time in a car you have to use the keys to
actually get into the car, so your analogy is not the same.

 

Keyless ignition Theo, open the door while the remote is in your pocket
then nobody knows who's car it is

 

Then your car is not the same as mine Kev,
I don't use a key, just a remote

 

No, but you do win the prize as the most time waster to get ready for a ride

 

--

Yes I was trying to say that the 30kg weight, falling 600mm, exerts
additional force on the point because of its velocity.
I was also trying to illustrate how much.

Nylon rope has a little stretch so will absorb a little force.
So will stretch in the jacket and anything else that may bend.

 

Is yours a standard handgun?

Theo

 

Oh dear. So then it doesn't matter if the keys are in your pocket after you
do up the seatbelt, does it. You just press the start button.

Theo

 

Start button ??

Oh dear me Theo, you have gone back to the 60's

 

Obviously not used to expensive cars there jorge

 

On 12/01/2011 2:10 PM, Peter wrote:

Yes I was trying to say that the 30kg weight, falling 600mm, exerts
additional force on the point because of its velocity.
I was also trying to illustrate how much.

Nylon rope has a little stretch so will absorb a little force.
So will stretch in the jacket and anything else that may bend.

1. Howsybout putting your posts above the double dash in future so they
don't get dumped by most newsreaders when replying? The point of the
double dash is to trim the sig.

2. I got 1.25kN after making some assumptions about stopping distance
and time to fall, so your original post is near enough. Using:

Deceleration Force = Terminal Velocity ^ 2 / (Distance x 2)

where 'Distance' is distance travelled by the object after terminal
velocity is reached.

If you've ever wanted to know what happens when an Irresistible Force
meets an Immovable Object, just insert zero as the distance the
Immovable Object yields. Infinite force = infinite kinetic energy = Big
Bang.

 

You did say keyless ignition. Maybe I'm not talking the same cars as you. I
assumed keyless ignition as found in some, less modestly priced, new cars,
where the key remains in your pocket at all times and the key's proximity to
the car unlocks the doors. They also generally have "keyless ignition' where
the key remains in your pocket and you press a "start" button on the dash to
ignite the engine.

Were you perhaps talking about some after-market thing that hangs on your
key which unlocks the doors when you press it? Where you still need the key
to start the vehicle?

How quaint. Hardly keyless then, is it?

Theo

 

Oh yes, how silly of me!
It's much more efficient to stop somewhere and zip up the jacket,
going through the whole gloves/keys rigmarole again. And of course its
very efficient to do a U Turn to pick up the dropped gloves that you
forgot to put back on.
Time management your strong point then

 

Ok. Sorry & thanks for the tip.
I am using something new.

I normally just go around.

 

OK so not sure why you're calculating the falling velocity of a 30kg
weight but I'm sure your calculations are all correct. How does that
relate to a person stepping off a bike and stepping away with a cord
still connecting the jacket to the bike? Assume that it's not a
vertical drop, and their velocity doesn't increase.

Nev..

 

The inertia of the 80 kg person moving away from the bike. Try thinking this
way. Tie a 1 metre string to your finger with a brick on the end. Hold it
out in front of you. Not too bad but you can't do it for long. Now grab the
brick with your other hand, hold it level with the finger the string is tied
to. Now drop it. Still feel like three kg of pull on the string? Still have
a finger?

You can easily exceed the 30kg separation force if you walk away from the
bike and become instant Michelin man.

Theo