Birds fly through the air. What force(s) act on the birds?

Sliding friction

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Air drag

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Gravitational force

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Static friction

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Solution

The correct options are
B Air drag
C Gravitational force
Birds fly through the air so they have some relative velocity with respect to air. Hence, air drag acts on it. They are not moving on a rough surface. So static and sliding friction will not act. On any object on the earth the gravitational force of earth is always acting.

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