Conservation of Momentum

Newton Collider



#23 - Recoil Problem - When interacting objects start from rest


m1v1 = m2v2



"What is the total momentum before
cannon is fired?"

"Total momentum after clown is fired?"





"Total momentum
before=0. (at rest)

"Total momentum after
 = 0. (momenta are
equal but opposite.)"



Rifle Recoil
Dr. Dave's Hall of Fame



"In real life, it would be

foolish to shoot a rifle

 like this.  Why?"




"The recoil on that rifle

would throw the

shooter's shoulder out!"



Ex 1) A 4.0 kg rifle fires a
5.0 x 10-3 kg bullet at a velocity of 500. m/s.  What is the velocity acquired by the rifle?




(Not in Reference Table)




Momenta before/after= 0 before

Equal Mass





Total momentum after = 0 ??







What is the velocity

of the cannon below?



m1v1 = m2v2


500 kg(V1) = 100 kg(15 m/s)



V1 = 3 m/s








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