Category 1: Momentum was found that after the collision was less than before the collision by 10%. This was not what has been expected, so the difference was fairly significant. This happened because of friction, when the two pucks collided, they have lost a bit of their momentum, so the momentum after the collision differed. Kinetic energy differed more than what was expected, it was significantly less after the collision, the difference before and after the collision was 63.7%, so 36.3% of that momentum was lost. This have occurred because the collision is inelastic and since there was friction when the two pucks collided, their speed became less, and speed is directly proportional to kinetic energy.
Category 2: the change of momentum before and after the collisions differed slightly, the change of momentum before the collision was less than that after the collision. This was not what was expected, but because the collision was inelastic and experienced friction when the two pucks collided, the time before the collision differed from that after the collision. After the collision, the pucks lost some speed and so it took more time to cover the same distance before the collisions. In the equation time will become less and change in momentum is directly proportional to time.
Category 3: the pucks did stick together when they collided and moved together. The total kinetic energy did differ significantly, the difference between the collision before and after was 77.3%, so 22.7% of the energy was lost after the collision. This occurred because it was an inelastic collision. Due to the colliding and sticking together, that rest of the energy lost, was transferred to thermal and sound energy. What has been expected about this category was true to conclude then.
Category 4: isolating and solving for the mass using the conservation of momentum formula seemed fairly workable. The mass that was calculated tended to be 0.152kg or 152g. this...
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