General Knowledge - Physics - Discussion

The boat will move if the fan is directed outside the boat if the wind is thrown outside the boat. If the fan is inside the boat, the boat will not move since the force by the wind of the fan will act on the wall of the boat, and will get cancelled.

It ia a sail boat not a motor boat so its not moving.

The boat won't move unless it is equipped with provisions to transfer the thrust generated on fan to the body of the boat.

It is applicable for all scales of fans. So in the question, it is not clearly mentioned.

Even though there is an application of Newton's third law. As the action force by the fan receives reaction to itself. Not to the boat on this case. This is the reason why ships and watercraft are equipped with an arrangement called thrust block.

The boat will move according to Newton's third law.

According to me it will move in opposite directions of blow of the blow of the air by fan because in reaction of the force by fan atmosphere will also exert force which will be equal to magnitude of the force of fan but opposite in direction of air blow by fan.

B is correct. When the fan pushes the sail by the air then air also pushes the fan in the opposite direction. Since fan is also a part of the boat, the vector-sum of the momenta of fan and boat is zero.

As per Newtons third law boat will move in opposite direction.

Then what is the principle of airboat?

Actually may be a little bit movement will be there but firstly when fan produces air then the sail gets affected which makes the boat to move in opposite direction to the movement through force of air to the boat. And that leads to null and makes boat to be at initial point only as it is. i.e. Stationary. So B is somehow correct.

Answer is the boat will not move.

As the air is blown on fan so to move forward fan give equal and opposite reaction to boat Ian the opposite direction s boat will be at the same place.