SSC MTS EXAM

SSC

PHYSICS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A bird flies by flapping its wings downward and backward. What reactive force causes the bird to fly and what direction does it push?

A	Air pushe the bird downward and forward.
B	Air pushes the bird upward and forward.
C	Gravity bird pushes the bird upward and forward.
D	None of the above

Explanation:

Detailed explanation-1: -According to Newtonian mechanics, a bird’s wings accelerate (a) a mass of air (m) downwards, to create a downward force (Force =ma). The reaction provides lift that pushes the bird up. The wings impart momentum to the air to create lift.

Detailed explanation-2: -There are two components to bird flight: lift and thrust. “Lift” refers to the upward force that allows a bird to stay aloft in the air despite its weight, while “thrust” refers to the horizontal force that allows a bird to move forward through the air.

Detailed explanation-3: -When a bird flies, its wings push in a down-ward and a backward direction. This pushes air downward and backward. By Newton’s third law, the air pushes back on the bird in the opposite directions-upward and forward. This force keeps a bird in the air and propels it forward.

There is 1 question to complete.