Recent content by PHYSICSSSTUDENT

I am interested in how energy is conserved in this process. I knew momentum will always be conserved but not the total KE. So, I don't know how to count every particle during the collision. You know, friction is a mysterious thing.

Because I wonder how the principle of conservation of energy can apply to any problem, thanks for your reply from which I know there may also be energy loss via sound.

Suppose a bullet with high speed strike a wooden block and move together after collision. We know there is loss in total KE of bullet-wooden block system. The question is, if the part of the loss in KE of the bullet is transfer to heat energy, HOW to prove the CONSERVATION of ENERGY in this...