The Sky is Falling
Liberty insurance has a commercial about how well they take care of safety by doing such things as teaching teenagers that crashing a car at 40 mph is the same as car falling from 4 stories.
I haven't had physics in a while and when I did, I didn't pay much attention, but a car falling from 4 storeis, or from anything is accelerating because of gravity. A car traveling at 40 mph is NOT accelerating. When they hit the ground they are both roughly traveling 1.25 ft/sec, but that's beside the point. F=ma or Force = mass x acceleration. Compare acceleration at 32 ft/sec^2 versus 0 ft/sec^2.
If anyone has more of a background in physics I'd really like to see the numbers and the difference in force of the two impacts.
UPDATE:
Rob: you are a little confused
Rob: the problem with your theory is that you are not looking at the right issue
Rob: KE = 1/2mv^2
Rob: they will hit the groud/wall with approximately the same energy which is what determines the severity of the crash...not the force
I haven't had physics in a while and when I did, I didn't pay much attention, but a car falling from 4 storeis, or from anything is accelerating because of gravity. A car traveling at 40 mph is NOT accelerating. When they hit the ground they are both roughly traveling 1.25 ft/sec, but that's beside the point. F=ma or Force = mass x acceleration. Compare acceleration at 32 ft/sec^2 versus 0 ft/sec^2.
If anyone has more of a background in physics I'd really like to see the numbers and the difference in force of the two impacts.
UPDATE:
Rob: you are a little confused
Rob: the problem with your theory is that you are not looking at the right issue
Rob: KE = 1/2mv^2
Rob: they will hit the groud/wall with approximately the same energy which is what determines the severity of the crash...not the force
posted by Armen Adzhemyan at 3:28 PM
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