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Momentum & its conservation. Car truck collision. F c. F t. F t = m t. change in v t time. F c = m c. change in v c time. F c time = m c change in v c. F t time = m t change in v t. F c time + F t time = m c change in v c + m t change in v t. - PowerPoint PPT Presentation
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Momentum & its conservation
Fc Ft
Fc = mc change in vc time
Fc time = mc change in vc
Ft = mt change in vt time
Ft time = mt change in vt
Fc time + Ft time = mc change in vc + mt change in vt
(Fc + Ft)time =change in mcvc + change in mtvt
Car truck collision
(Fc + Ft)time =change in (mcvc + mtvt)
Fc Ft
Car truck collision
(Fc + Ft)time =change in (mcvc + mtvt)
Newton’s 3rd law: Fc = -Ft (Fc + Ft)time = 0
0 = change in (mcvc + mtvt)
mcvc + mtvt stays constant!
Momentum = mvmcvc = momentum of car
Mtvt= momentum of thruck
mcvc + mtvt = total momentum
this changesthis changes
this stays constant
Momentum is conserved!
Before = -40
After = -40
True for all collisions
before =+20
after =+20
visit www.physicsclassroom.com/mmedia/index.html
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