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1. pressure-the exertion of force upon a surface by an object, fluid, etc., in contact with it
2. psi- pounds per square inch
3. center of mass- the point at which the entire mass of a body may be considered concentrated for some purposes;
4.  propulsion-the act or process of propelling
5.  Newtonʻs 1st Law- 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 another force
6.  Newtonʻs 2nd Law- The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
7.  Newtonʻs 3rd Law- For every action, there is an equal and opposite reaction

 http://www.physicsclassroom.com/
dictionary.reference.com/