General Principles. Modeling of problem Newton’s Law of Motion Law of Gravitation Units Vectors. Problem Solving Strategy:. Physical Model: Transformation of actual problem into simpler Assumptions Using Free Body Diagram : FBD Mathematical Model: Newton’s Law:
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Law #1: Body is in Equilibrium
Body will remain at rest or continue to move with same speed (accel.=0) and direction unless unbalance force is acted on body or particle.
Law #2: Non-equilibrium
Change of motion of a body is proportional to the next force imposed on the body and is in direction of net force.
If one body exerts a force on a second body, then second body exerts a force on the first body that is equal in magnitude, opposite in direction and collinear (same line of action).
G = 66.73x10-12 (m3/Kg/s2)
Universal gravitational const.
where: and on earth surface:
g= 9.807m/s2 (SI) or g= 32.17 ft/s2 (US)
Tables 1.6 and 1.7 in book
A = Value to be Compared
B = Reference Value
% Error = (A-B)/B (100%)