Is Momentum and Kinetic Energy Conserved in Collisions?

  • Thread starter Thread starter Habibrobert
  • Start date Start date
  • Tags Tags
    Collisions Lab
AI Thread Summary
Momentum is conserved in all types of collisions, including elastic, super elastic, and inelastic. In elastic and super elastic collisions, both momentum and kinetic energy are conserved, while inelastic collisions only conserve momentum. The discussion highlights concerns about the accuracy of numerical results, suggesting that values should not exceed 1 and that the final to initial momentum ratio should be near 1. Clarification on the experimental setup is requested to better assess the calculations. Accurate understanding of these principles is crucial for completing the physics lab correctly.
Habibrobert
Messages
7
Reaction score
0
Hello,

I am stuck on the last page of my physics post lab. The lab was on elastic, super elastic and inelastic collisions. The point of the lab is to see whether or not momentum and kinetic energy is conserved during each scenario.

I'm pretty sure that in the elastic and super elastic collisions momentum and kinetic energy is conserved.

I know that kinetic energy is not conserved in a inelastic collision.

Could someone please check my work and let me know if I am doing everything correct?

Many Thanks
 

Attachments

  • Screen Shot 2013-02-22 at 1.48.10 PM.png
    Screen Shot 2013-02-22 at 1.48.10 PM.png
    39.5 KB · Views: 468
Physics news on Phys.org
Your numbers look really strange. Judging from the questions, you should have no numbers much above 1, and the Pf/Pi ratio should be close to 1. Maybe I misguess what these numbers represent. How about describing the experiment?
 
Thread 'Minimum mass of a block'
Here we know that if block B is going to move up or just be at the verge of moving up ##Mg \sin \theta ## will act downwards and maximum static friction will act downwards ## \mu Mg \cos \theta ## Now what im confused by is how will we know " how quickly" block B reaches its maximum static friction value without any numbers, the suggested solution says that when block A is at its maximum extension, then block B will start to move up but with a certain set of values couldn't block A reach...
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
Back
Top