General Knowledge - Physics - Discussion

The boat will move. The air which is propelled by the fan will give an equal and opposite reaction/force to the fan and the fan will tend to move and as the fan is attached to the boat the boat will tend to move. If this force is more than the threshold force to move the boat the boat will definitely move in a direction opposite to the motion of the air. This simple principle is used in aeroplanes where the air is heated to get more thrust.

Air is less denser than water. So large fan is needed. Otherwise it must be a hovercraft.

Please suggest a particular reason for no motion.

I totally disagree with amit and shiyas because the force [thrust] acts on a body[boat] in a perpendicular direction.

I agree with Shiyas, It will definitely move if force is enough.

The boat will move!!!If sufficient thrust is produced.

This case is similar to propeller aircraft in which the propeller is mounted on the aircraft.when propeller turns air is blown and as the momentum of air changes it imparts reaction on the blades of the propeller,which in turn moves the air craft.

Becouse every action there is equal and opposit reaction. So for movement of a body there is need of reaction, which is not available to boat becouse fan is monted on boat itself.

Why the boat does not move?