
According to the book, the formula is: $$ F\cos\theta - mg\sin\theta = ma $$
It also says to set $a = 0$.
I don't understand how to solve it.
Also, why is $a = 0$? And isn't the right formula $F = ma$?

According to the book, the formula is: $$ F\cos\theta - mg\sin\theta = ma $$
It also says to set $a = 0$.
I don't understand how to solve it.
Also, why is $a = 0$? And isn't the right formula $F = ma$?
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