List all the forces acting on the baseball at the top of its path?

If you want strict answer, here is it:

Major force is Gravitational force, direction is downwards.

Minor force are Frictional force by air and Force by air resistance, both direction is opposite of motion.

Hope it answer your question.

On a real baseball in its path (meaning when is in the air) there are two forces acting, the gravitational attraction from the earth and the friction with the air. In fact, it is the friction waht allows pitchers to make the ball curve.

Gravity, due to (mostly) earth, and also moon, sun, you, etc.

For extra credit, you can also add the following in rough order of decreasing importance:

-If there is a wind, then there is a sideways pressure.

-Inward force due to the huge column of air above the ball pushing down on it.

-Slight forces due to sound waves impacting the ball.

-Buoyancy force upwards due to air pressure difference between top and bottom of ball.

-If the ball is spinning, the ball is pulled due to the Magnus effect.

-If the ball is illuminated by light, then there is a slight photon pressure due to photons striking the ball more on one side (ok, this is really getting picky because the effect is soooo small, but it's real)

gravity is the only force acting on it