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If two objects move together after impact, is the collision elastic or inelastic?

inelastic.


What occurs during an inelastic collision?

kinetic energy is lost due to heat, sound, deformation, etc. ==>
 cannot use equation for conservation of kinetic energy.  can use the equation for conservation of momentum. 

If one object is moving straight north and another object hits it at an angle, what will be the speed and its direction of the combined objects (inelastic collisions)?

break down x and y components and use conservation of momentum (cannot use conservation of KE since inelastic).
 Note: The final angle should be less than the angle that the object hit at. 

 Direction of before will be the same as direction after b/c momentum is conserved!
 The initial momentum of the system is simply the momentum of the 1.0kg object, since the other object is at rest. The momentum is 1.0kg x 5m/s = 5kg m/s pointing to the south. Since the momentum is conserved, this must also be the final momentum of the system after the collision. 
Ball is traveling south and hits another ball at rest. What is the momentum after the collision.


delta(E)=Work=Fd
BE AWARE OF THAT THE QUESTION IS ASKING YOU ONLY FOR THE ENERGY DONE BY FRICTION. SO ONLY FIND THE FRICTIONAL FORCE AND SOLVE FOR WORK. 
how much energy is dissipated as friction.
