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?"

Larger

 

 

 

"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

cars_explosion.mpg

W.F.U.

 

 

Total momentum after = 0 ??

carsExplosionUneq.mpg

W.F.U.

 

 

 

 

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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