Move the block horizontally. Why? Does that make the block work vertically

Move the block horizontally. Why? Does that make the block work vertically

Gravity and support force perpendicular to s direction of displacement do not work
Pull (or push) f to do positive work, because f is not perpendicular to s, there is displacement in the direction of F, or there is component in the direction of S
The friction f does negative work, and the direction of F is opposite to that of S