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A bird has a forward force due to its wings of 3 N. The drag force of the air is 2 N backwards and its lift force and the force of gravity are 2 N upwards and downwards, respectively. What is the net force on the bird? A. 9 N B. 1 N forwards C. 7 N forwards D. 1 N backwards

Respuesta :

AL2006

The net vertical force is (2N up) + (2N down) = zero.

The net horizontal force is (3N forward) + (2N backward) = 1N forward.

That's the net force on the whole bird. It's choice-B, and the bird accelerates straight forward.

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