EN PH131 Chapter Notes - Chapter 12: Euclidean Vector
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21 Apr 2016
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When air resistance is neglected, the only force acting on the projectile is its weight, which causes the projectile to have a constant downward acceleration of approximately ac = g = 9. 81 m/s2. Since ax = 0, application of the constant acceleration equations yields. Since the +ve y axis is directed upward, then ay = -g, applying these to the constant acceleration equations, we get: The last equation can be formulated on the basis of eliminating the time t from the first 2 equations, so only two of the above equations are independent of one another. Problems involving the motion of a projectile can have at most 3 unknowns since only 3 independent equations can be written; one equation in the horizontal direction, and 2 in the vertical directions.
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