In fact, whether it is static, uniform or accelerating, there are only three forces, gravity, support and friction!
It's just that the stress is different in different situations.
At rest, g * Sina.
When coasting at a constant speed, g * Sina = ug * COSA = F.
G * Sina & gtUG*cosa=f, so there will be an acceleration sliding along the inclined plane, that is, (g * Sina-ug * COSA)/m = g * Sina-ug * COSA.
The stress on the schematic diagram is still the same!