The total momentum of a flock of identical birds could be zero only if the birds areA. Taking off from the groundB. Flying in the same directionC. Flying in different directionD. very tired and coming down to rest
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Since the momentum of a system is the vector sum of all particles' momenta, if the birds are flying in opposite directions, the net momentum of the flock could be zero. So, it is C. Flying in Different Direction.
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Answer: The total momentum of a flock of identical birds could be zero only if the birds are flying in different direction.
Explanation:
Momentum :- the quantity of motion an objects has is generally defined by momentum. Mathematically momentum is defined as the product of two variables ( velocity and mass) . Momentum is a vector, means it has direction.
Momentum = velocity × mass
Now, momentum can be zero in given conditions:-
- Velocity of the object is zero
- Mass of the object is zero ( practically not possible , but some particles have zero rest mass)
- Sum of momentum of individual particles ( constituting the object ) is zero.
In the given question , as the momentum of flock of birds(object) is zero that is possible only if birds are flying in different direction, such that the momentum of each bird is cancelled by other bird.
- when the birds are taking off the ground, all of the birds are moving in same direction with some velocity, thus the flock has some momentum
- when birds are flying in the same direction ,then also there is some velocity and mass ,thus the momentum is not zero
- when the birds are coming down , then also the direction is same and the velocity is present ,thus momentum is not zero.
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