Assume that the Play-Doh and the superball have the same mass, and that you thro
ID: 1779382 • Letter: A
Question
Assume that the Play-Doh and the superball have the same mass, and that you throw them with the same velocity. Which would you throw to close the door–the Play-Doh, which will stick to the door, or the superball? Give reasons for your choice using any notions you already have or any new concepts developed in physics, such as force, energy, momentum, or Newton’s laws. If you think that there is no difference, justify your answer.
If direction towards the door is negative the initial momentum pi is negative and final momentum P is positive (elastic) or zero (inelastic). Therefore Apelastic-Pf- Pi)2p, which is twice as much as piolastic:0-(-pi) =p The initial momentum Pi is the same or elastic collision as its final momentum Pf The final momentum of the inelastic collision is zero. Therefore Pelastic Pr Pi =0 which is smaller than The initial momentum of the elastic and inelastic balls are the same therefore only final momenta would make the difference. Therefore Apelastic-P Pi which is larger than Apinelastic- elastic=-pi therefore the changes in momenta are the same for two Only non-zero and non-equal components of the momentum should be accounted for. Therefore Apelasticsp,- , and balls but opposite in the directionExplanation / Answer
To close the door we will throw superball.Because superball will bounces off the door with no loss in speed.So its change in momentum :[ here initial and final velocity will be same]
del p = final momentum - initial momentum
del p = mV - ( - mV) = 2mV
But in case of play doh, It will sticks to the door and continues to move along with it.So its final velocity will be less than that of initial velocity.So its change in momentum(del p) will be less than that od Superball.
So it imparts less del p to the door.hence superball will be more effective to throw on the door.