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St. Mary's U. Astronomy and Physics Dept.
When a fluid, moves in a single direction, it exerts very little pressure
perpendicular to the direction of its flow.
Quick Resultants Review Same direction  ADD Opp. Direction  Subtract 90 degrees  Pyth.
A. Resultants  Angle ≠ 90°
Find F_{y} and F_{x} of resultant Find F_{y} and F_{x} of resultant
F_{x} = 4N  3N = 1N F_{y} = 3N  1N = 2N
Ex) 5 N North & 3 N 30° S of E act concurrently (on a single point).
Find the F_{x} and F_{y}
1. Sketch Vectors
1. Combine F_{x} and F_{y} ΣF_{x} = 0 + 3Ncos30
ΣF_{x} = 2.6 N
ΣF_{y} = 5N  3 Nsin30
ΣF_{y} = 3.5 N Pyth. Theorem and Tangent R = 4.5 N 53° N of E
E = 4.5 N 53° S of W
AP Question Hewitt Question
Ex) Relative to the ground, an airplane gains speed when it encounters wind from behind, and loses speed when it encounters wind head on.
When it encounters wind at a right angle to the direction it is pointing, its speed relative to the ground below A. increases. B. decreases. C. is the same as if there were no wind. D. Need more information.
Increases
ŠTony Mangiacapre.,
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