![]() ![]() The mass and velocity of the airplane change during the flight to values m 1 and V1. The airplane’s new location is X 1 and time t 1. An external force F to the airplane shown above moves it to point “1”. The airplane has a mass m 0 and travels at velocity V 0. Let us assume that we have an airplane at a point “0” defined by its location X 0 and time t 0. His second law defines a force to be equal to change in momentum (mass times velocity) per change in time. Momentum is defined to be the mass m of an object times its velocity V. Newton’s Second Law: Force The acceleration of an object depends on the mass of the object and the amount of force applied.
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