Most of the period 2 labs and some of the period 4 labs missed the point again. You were supposed to find the ideal Fnet from M2 x 9.8 - M1 x 9.8 and then compare it with Mtotal x a measured to see if Fnet = Ma. Mtotal = total cart mass plus M1 and M2.
Any difference can be ascribed to friction.
A similar approach to the first a=F/M lab is described in posts of 10/21 and 10/24. Read them now, especially if you still have an a=F?M lab to submit or resubmit.
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