General Knowledge - Physics - Discussion
Discussion Forum : Physics - Section 1 (Q.No. 57)
57.
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
Discussion:
59 comments Page 2 of 6.
Alia said:
1 decade ago
Answer is B because by newton's third law of motion every action has opposite & equal reaction but here the boat will not move because the force is not sufficient to make the boat to move & for newton's third law mass must be equal to form equal reaction.
Shubham kumar said:
7 years ago
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.
Aravind said:
1 decade ago
When the fan pushes the sail by blowing air, the air also pushes the fan in opposite direction. As the fan is a part of the boat, the vector sum of the momenta of the fan and the boat is zero. The boat will only move if some external agency applies force on it.
Swapnil Pawar said:
4 years ago
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.
Shiyas said:
1 decade ago
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.
IJOM NINU said:
8 years ago
Question is not clear.
Because whether the fan has been fitted inside compartment for air circulation or it has been fitted on the edge of boat? in two cases, it will have differnt answer, for first, it will nor move, for second, it will move.
Because whether the fan has been fitted inside compartment for air circulation or it has been fitted on the edge of boat? in two cases, it will have differnt answer, for first, it will nor move, for second, it will move.
KARTIKEYA said:
1 decade ago
If the boat does not moves then I can also give a reason that car will not move because engine is mounted to it.
The fan is capable of producing enough thrust to move the boat.
I disagree with @Banshi dhar and @Ajay.
The fan is capable of producing enough thrust to move the boat.
I disagree with @Banshi dhar and @Ajay.
Abhinand said:
7 years ago
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.
Varun Dhawan said:
8 years ago
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.
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.
Ajay said:
1 decade ago
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.
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