A model airplane of mass 0.3 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.9 m, making 1.6 revolutions every 4 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the plane.) The accelaration due to the gravity is 9.81 m/s2 Find the tension in the string. Answer in units of N.

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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?”