Question

List all the forces that act on a hot air ballon when it is in the sky

Answer 1

gravity, acceleration, kinetic energy, the atmosphere

Answer 2

Down ... gravity
Up ....... buoyancy

When these are equal, then the balloon either stays at the same altitude,
or moves up or down at a constant rate.

Horizontal ... wind

When wind is not zero, the balloon accelerates in the direction of the wind.