Posted on 10/28/2007 6:01:06 PM PDT by Diana in Wisconsin
OK, I don’t get it.
Acceleration is the rate at which something is increasing it’s velocity. Right? Why is this relevant to the force generated when a mass moving at a particular velocity stops suddenly?
I suspect we’re saying the same thing. That the acceleration in question is actually the deceleration created when the mass stops moving.
Yes. F=1/2MV^2
Mr. Clark should sue the children! :-) How are you?
The force is one half the mass times the square of the velocity, so doubling the speed quadruples the force of the impact.
Thanks, that makes a lot more sense.
I still remember riding a bus to Montréal on the 401 when we passed a car that had a shelf behind the back seat. There was a kid lying across it sleeping :-O
You indeed answered your own question. Deceleration is simply negative acceleration; the force is the same but in the opposite direction.
Deceleration is called negative acceleration in physics. What determines the force exerted by an object when it stops is its mass times the acceleration. The acceleration is determined by the changed in velocity divided by the time of the collision. That time is usually very small, so the acceleration is huge. Therefore the force exerted by the child seat is pretty big.
Your Mom and ours must have been good pals.
We'd practice with our Daisy BB rifles from the front seat, and hand Mom canned Daquiris from the cooler (a huge Coleman aluminum jobbie kept conveniently right behind the passenger seat) and light her Pall Malls. The back seat was mostly for our empty KFC boxes.
No, that is kinetic energy, not force. See post #28. The change in speed divided by the time of collision determines the force exerted by a mass.
No, that is momentum. Momentum is not force. Again, see post #28. The key thing is change in speed divided by time.
So you don't have airbags, right?
They don't print that on anvils either, but most would agree it's obvious.
If I had known it could have been a problem, I clearly would have suggested that maybe we want to take the seat out of the car," he said.
I feel for this guy, I really do. He's been in a terrible accident which unfortunately was exacerbated by his and his friends lack of common sense and attention. Problem is, behind him is standing some ambulance-chasing lawyer fishing for a lawsuit.
I think to demonstrate the dangers of having something with more mass than the box of tissues, they may have stuck a bowling ball in the back for the finale.
I prefer the unsecured dual speakers with 5 pound magnets and plenty of sharp edges. If you don't have those, several concrete blocks with machetes attached will do.
“Why not the front hood? Much better view.”
Dude, you know that isn’t done until High School.
Nor a spouse apparently.
Actually, if you poll enough of a sample, you will find people who lost siblings who were riding in the back of a pickup.
In high school I made a comment about being in the back of the pickup and standing. A classmate said that was what his sister was doing before she died.
My bad- I said force but should've said energy.
I think they used the rubber from an inner tube to support the cone.
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