Question

1. Write Newton's 2nd Law in terms of momentum, p. 2. Why is momentum a more physically fundamental quantity than velocity? 3. In terms of forces, what would the universe be like, qualitatively if, instead, momentum were p=>? 4. A finite collection of particles is contained in a box. The particles collide elastically with one another and the interior of the box. If we consider only the particles, then what, if any, forces are External Forces? 5. Determine the total impulse, į, of the box-particle system from the previous question? 6. Which of Newton's Laws allowed us to derive the condition necessary for total momentum to be conserved? 7. How does kinetic energy mathematically define motion? (Hint: I'm not asking for the formula.] 8. Is it possible for the change in kinetic energy to be negative? Briefly explain your answer. 9. Is it possible to have a zero kinetic energy but a non-zero net force? Briefly explain. 10. Is it possible to have a zero change in kinetic energy but a non-zero net force? Briefly explain. 11. Is it possible to have a non-zero kinetic energy but a zero change in kinetic energy? Briefly explain.

Answer 1

o Neulton second Law F = of a The rate of change of momentum is equal to the applied force. momentum in the multiplication of velocity and mass IP = mv, so,ut describe two quantity simultaneously. - final velocity. u and y are thatial and V -V + 4 let n particle inside the box. Assuming all of the same mass. The interaction of particle are internal force by hewton third haw. © let the particle velocilly as v. - J = DP = him (vac-u))= (2mvin This is the change in momentum of particles after elaster Collision of particles with the bon. G o Tatal impulse so, Net force sum between particles and boxe es pero using Newton in third law Newton's third how ( Reaction Action law) 0 Kinetic energy represent the energy in the particle when it is moving. Yes, a gf final kinetic ebergy is less. than the initial Kinetic energy. @

forces always cause nation, of het force is . Satic 0ч дЩ Коля дохо ( Due to force the body either accelerate of decelerate, since Kinetic energy will change auth time. so it is not possible to chosgain Kinetic energy zero. Yes, if initial and final kinetic energy are same than, particle having the kinetic reserga but chasge in kinetic energy is zero DK= Kg -ki , Kaki TOK=0 In this case particle travel with constant velocity, and het force on the body is zero.