This listing features two labs about the conservation of momentum using marbles. I facilitate this activity series on successive days in my eighth-grade physical science class. This lab set aligns with our unit about Newton’s three laws. In the first lab activity, students determine if there is a positive correlation between the number of marbles released down the ruler ramp and the number of stationary marbles ejected upon impact on the bottom, flat portion of the track. In the second lab activ