The figure shows a box of mass m2 on a frictionless plane inclined at angle θ

[@AngelYZ125]

THANK YOU FOR THIS!!! This one and another one of your videos will allow me to go to sleep at a reason hour tonight.

[@rhodlavalasse]

question. I got -9.8 when I compute sin(30˚), which gives me a=-1.8. S why exactly did you get a=1.8. Help me out please.

[@takeawaythestars]

What if the horizontal surface is not frictionless?

[@abdulrhmanseed]

Then you just consider it in the force body diagram

[@piemeimeiii]

why part b the tension can be 0?

[@SantiagoDiaz-my2jk]

how can you just add the two equations together??

[@rameeshaikram920]

Much helpful

[@aniketkumarsinha2537]

in 2nd box you take -T why

[@youenvi]

Look at coordinate system established. The tension force points in the negative x-direction.