Gravity is The natural force of attraction exerted by a celestial body, such as Earth, upon objects at or near its surface, tending to draw them toward the center of the body.
Force Any of various factors that cause a body to change its speed, direction, or shape. Force is a vector quantity, having both magnitude and direction.
Drag is a force acting on a moving object or body in the opposite direction of the body or object, caused by the interaction of the body and the medium its going through.
Aerodynamics is a design to reduce or minimize the drag caused by air as an object moves though it or by wind that strikes and flows around an object. The wings and bodies of airplanes have an aerodynamic shape.
Friction is a force that resists the relative motion or tendency to such motion of two bodies or substances in contact. The rubbing of one object or surface against another that creates a force.
Escape Velocity The minimum velocity that a body must keep to escape a gravitational field completely.
Dynamics is the branch of physics that deals with the effects of forces on the motions of bodies. Also called kinetics.
Stirling Engine is an external-combustion engine that uses air or an inert gas as the working fluid operating on a highly efficient thermodynamic cycle (the Stirling cycle).
Multiple Expansion Engine is An engine in which the expansion of the steam or other working fluid is divided into two or more stages, which are performed successively in cylinders of increasing size.
Uniflow Engine is an engine in which the steam or gas enters through admission valves at the ends of the cylinder and escapes through exhaust ports uncovered by the piston as it nears the end of its stroke.
Turbine Engine is An internal-combustion engine consisting essentially of an air compressor, combustion chamber, and turbine wheel that is turned by the expanding products of combustion.
Rotary Steam Engine is an aninternal-combustion engine having radical cylinders that rotates about a fixed crankshaft.
Jet-type Steam Engine is a reaction engine that discharges a fast moving jet which generates thrust by jet propulsion in accordance with newton's law of motion.
Rocket-type Steam Engine is simply a pressure vessel with hot water at high pressure, and open a valve leading to a nozzle, The drop in pressure immediately boils some of the water and the steam leaves through a nozzle, giving a significant propulsive force.