Скачать с ютуб Inelastic collision | What is conserved? | Linear momentum? Kinetic energy? | Analysis of mistakes. в хорошем качестве

Inelastic collision | What is conserved? | Linear momentum? Kinetic energy? | Analysis of mistakes.

Two solutions of the problem (bullet collides with a block) are considered and analyzed. One of solutions is incorrect. Mistake is analyzed. A bullet of mass 10 g strikes a block of mass 2.0 kg as shown in figure. Assuming that the bullet remains embedded in the block calculate the bullet’s initial speed, v1, if the block immediately after collision moves at a speed v2 = 1.2 m/s. Neglect friction between the block and surface and the gravitational force on the bullet. 00:00 Problem formulation 00:29 First solution 03:09 Second solution 05:25 Analysis of the first solution 06:45 Analysis of the second solution 08:10 Conclusion The common mistake (see the first solution) is that the mechanical energy conservation law does not work for the system with internal frictional force. In this problem, such a force exists between block and bullet. It is nonconservative one and mechanical energy of the system does not conserve. #momentum #inelastic_collision #block #bullet