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**__ Rocket Stability __** For a stable ability or a stable flight the center of gravity must be above center of pressure. If you want to improve stability you should add weight to the nose and increase the fin area. If the center of gravity is located above the center of pressure, the rocket will return to its initial flight conditions if disturbed. Inventors call this a restoring force because the forces restore the vehicle to its initial condition and the rocket is set to be stable. If the center of pressure is above the center of gravity, the lift and drag forces maintain their directions but the direction of the rotation is generated by the forces and reversed. They call it de-stabilizing force. Any small movement of the nose generates forces that cause the displacement to increase.

__**Four Forces of Flight**__ Weight, lift, thrust and drag are the acting forces on an airplane. Assuming a straight and level flight, lift must be equal to weight and drag must be equal to thrust. This is what happens if this equilibrium is broken If the lift becomes greater than weight, then the plane will accelerate upward. If the weight is greater than the lift, then the plane will accelerate downward. When the thrust becomes greater than the drag, the plane will accelerate forward. If drag becomes greater than the thrust a deceleration will occur.

__**A Rocket in Flight**__ A rocket model in flight is like an airplane in flight all depends on the forces of weight, thrust, and aerodynamic forces, “lift and “drag”. The weight of a model rocket has is fairly constant. At launch of the rocket the fore of the rocket engine is higher than the weight of the rocket and the net force accelerates the rocket away from the pad. Afterwards when all is done the rocket begins to fall by the power of gravity back to the earth.

**__Newton’s First Law__** Newton’s first law of motion deals with inertia, and is often referred to as the law of inertia. The first law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

**__ N __****__ ewton’s second law __** Newton’s second law deals with the power of Acceleration it’s produced when a force acts on a mass. The more mass you have the more amount of force needed to accelerate the object.



__﻿**Newton's Third Law**__
Newton's third law states that every action has an equal and opposite reaction. For example, if you were in a boat moving forward and you were to throw a heavy object forward, the resulting force would slow you down, stop you, or reverse your direction.