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Momentum & its conservation

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.

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Momentum & its conservation

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  1. Momentum & its conservation

  2. Car truck collision Fc Ft Ft = mt change in vt time Fc = mc change in vc time Fc time = mc change in vc 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 inmtvt (Fc+Ft)time=change in(mcvc+mtvt)

  3. Car truck collision Fc Ft (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!

  4. Momentum = mv mcvc = momentum of car this changes this changes Mtvt= momentum of thruck mcvc+mtvt = total momentum this stays constant Before = -40 After = -40 Momentum is conserved!

  5. True for all collisions before =+20 after =+20 visit www.physicsclassroom.com/mmedia/index.html

  6. Revisit the canoe at the dock Initial momentum canoe = 0 boy = 0 Total = 0 final momentum canoe = mcvc boy = mbvb Total = 0

  7. Momentum is a vector: mvcollision in 2 dimensions

  8. eating Finding nemo

  9. Billiard balls 2 before after ptot 2 ptot 1 1

  10. Conservation of momentumon a sub-atomic level before p p ptot proton after p ptot p p- meson p- meson

  11. Rocket travel before P0 after P0 + p exhaust p

  12. Rifle recoil mV mV

  13. Machine-gun granny

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