bug windshield

bug windshield - On the highway of life, are you the bug or...

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Unformatted text preview: On the highway of life, are you the bug or the windshield? Bug hits windshield Bug hits windshield The force on each is… The same- Newtons third law You can only exert back as much force is exerted on you The time of impact is… The same- It would be impossible for the bug to hit the windshield for 2 seconds while the windshield hits the bug for 3 seconds The change of velocity on each is… Very Different – The car, hardly noticeable. The bug very noticeable. The bug slows down, stops and reverses direction The momentum before and after… The same – momentum is conserved in a collision • What about a BIGGER BUG? The force on each is… The same- Newtons third law You can only exert back as much force is exerted on you The time of impact is… The same- It would be impossible for the bug to hit the windshield for 2 seconds while the windshield hits the bug for 3 seconds The change of velocity on each is… Slightly Different – The car, slows down noticeably, The bug slows down stops and reverses direction • So Why Does the bug go splat, but a windshield doesn’t Its o n whe ly a Sm n wind a bug all forc e hits shie the ld It only ta kes a sm all force same si ze force to kill a bug. T h won’t hu at rt the wi ndshield the ce, ren rce if f e e f o e d f th Th o and e siz ulse m, u imp ment mo s small bug, the les the momentum, the in ,impulse,change force e more of each bigger the bug th What if the bug is the same mass and same speed as a car? They stop • What are some approximate numbers • • • • Car mass 1500 kg Car speed 60 mph 33m/s Bug mass 1 g = .001 kg Bug speed bug speed 10 mph 7 m/s • • • • 1500*33 + .001*-7 = ( 1500 + .001)v 49500+ -.007 = 1500.001*v 49499.993=1500.01*v 32.99= v • So the car’s velocity changes from 33 to 32.99, while the bug changes from -1 to 32.99 • ...
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This note was uploaded on 11/08/2011 for the course PHYSICS 121 taught by Professor Richardvanfleet during the Winter '09 term at BYU.

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bug windshield - On the highway of life, are you the bug or...

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