A gas-filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?

While sieving grains, small pieces fall down. Which force pulls them down?

Does force of gravity act on dust particles?

Does the force of gravitation exist between two astronauts in space?

A chapati maker is a machine which converts balls of dough into chapatis. What effect of force comes into play in this process?