Section+6+chap+3

=__//**Section 6- Conservation Of Momentum**//__=

=What do you see?= 3/8/11 page 310

one cart is rolling down a ramp kinda thing and its hitting a motionless cart at the bottom on the ramp.

=What do you think?= 3/8/11 page 310

momentum time mass velocity distance

toc

Investigate
3/10/11 page 310


 * Mass of car 1 (g) || Mass of car 2(g) || V of car 1 before collision(m/s) || Vof car 2 before collision || mass of combined cars after collision (g) || V of combined after col. (m/s) ||
 * 250 || 250 || .7 || 0 || 500 || .3 ||
 * 500 || 250 || .55 || 0 || 750 || .3 ||
 * 250 || 500 || .7 || 0 || 750 || .2 ||
 * 750 || 250 || .4 || 0 || 1000 || .25 ||

kg(m/s) || Momentum of object 2 kg(m/s) || Momentum of object 1 and 2 kg(m/s) || The momentum after a collision is very slightly less than before the collision. The loss of momentum comes only from friction
 * Before collision ||  || After collision ||
 * Momentum of object 1
 * .175 || 0 || .15 ||
 * .275 || 0 || .225 ||
 * .175 || 0 || .15 ||
 * .3 || 0 || .25 ||



Physics Talk
3/10/11 page 312

Law of conservation of momentum**:** the total momentum before a collision is equal to the total momentum after the collision if no external forces act on the system momentum BEFORE collision= momentum AFTER collision m1v1 + m2v2= (m1+m2)vf

Checking Up
3/10/11 page 315

1. The law of conservation of momentum is that the momentum before a collision is equal to the momentum after the collision 2. If you add up all of the momenta before a collision you know the sum of all the momenta after the collision will be the same because total momentum is conserved 3. 6,000 kgm/s

Physics To Go
3/10/11 page 319

1.C C = CC 2a p=mv p=2kgm/s 2b.. 4kgm/s 2c. 4 kgm/s 3. 4m/s 4. by having an external force acting' 5. vehicle B gains 4000, so the total is 8000 6. 5 m/s 7. 9.78 + 10 = 19.78 8. m1v1=m2v2 3(2)+1(2)=(3+1)vf vf=4 9.-1.2 m/s