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 in mtvt
(Fc + Ft)time =change in (mcvc + mtvt)

3. 0 = change in (mcvc + mtvt) mcvc + mtvt stays constant!
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. Mtvt= momentum of thruck mcvc + mtvt = total momentum
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

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: mv collision in 2 dimensions

8. eating
Finding nemo

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

10. Conservation of momentum on 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