The peregrine falcon is known to be the fastest animal on earth, reaching a top speed of 240 mph when hunting. When doing so, it does not flap its wings. Rather, it relies upon the gravitational force to accelerate it downwards. Assuming that it starts from rest, and assuming that drag forces are minimal, how long does it take for the hawk to reach its top speed? b. How far does it travel during this time? c. Near the top speed, drag forces become important, and in fact the terminal velocity is determined by the drag force. Assuming that the hawk’s body can be modeled as a cylinder, with its cross-sectional area equal to that of a circle with radius of 10 cm, what is the coefficient of drag ? for a hawk?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”