Alvarez+lab+12

8.1 If the mass of the cart is changed from 1 kg to 2 kg the change in momentum does not change. It gives and option to view the momentum under a force vs. time graph. The longer that the force is applied the longer that the momentum is changed.

8.2 This shows that kinetic energy does not remain the same if mass is changed. This is because when mass is changed the greater does not move at the same speed thus there is less kinetic energy. Momentum does stay the same.

8.3 The sum of the two impulses experienced by the balls must be zero. This is shown by the same amount of sums of momentum. so if one momentum goes down the other goes up by the same amount. forces are always equal and opposite.