The forces on mass m1 are the upward tension T as before, plus a downward acceleration m1gsinθ down the inclined plane. In this case, mass m1 will experience an upslo...The forces on mass m1 are the upward tension T as before, plus a downward acceleration m1gsinθ down the inclined plane. In this case, mass m1 will experience an upslope force equal to the tension T and a downslope force m1gsinθ. ΣiFi=m1a⇒T−m1gsinθ−μm1gcosθ=m1aa=m2−m1(μcosθ+sinθ)m1+m2g