I thought in Normal force was measured in grams, not kilograms. That may be where I went wrong. So the proper equation should be .31/1.5=.2? That seems pretty simple and for some reason feel like I've messed up somewhere else but if that's all that I seem to have done wrong then thanks!
A cart that weighs 1.5 kg is accelerating at .12 M/s^2 on a horizontal surface. The cart is being pulled by a weight of 50 grams. Find the coefficiant of friction.
I've been using F=ma so 1.5(.12)=.18N
the weight pulling is equal to .05kg(9.8)=.49N
.49-.18=.31N=Ff Ff=m(Fn)...