ASTR 101 Chapter Notes -Parabolic Trajectory, Escape Velocity, Hyperbolic Trajectory
1 Feb 2014
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Sir isaac newton: any object in a state of motion (including rest) will remain in that state unless some unbalanced force is acting. Assumed the force is unbalanced as changes in state usually do not occur if it is balanced. Counters galileo"s understanding of inertia as the moon"s orbit was not caused by natural coasting with no acting forces, as gravity was acting upon it. Space stations work in similar ways by remaining in earth"s gravity, their orbit is due to gravity as their initial direction of movement was a straight line. The second law: unbalanced forces: objects with more mass have greater inertia and need more force to be brought into motion or f = ma or a = f / m. F = amount of outside force on an object (unbalanced) = slowing down: more external force on an object yields higher acceleration, mass = the measure of total material in an object, not the size or weight.
