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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.
F. Resultants when angle between forces ≠ 90°
Ex) 5 N North & 3 N 30° S of E act concurrently (on a single point).
Find the resultant & equilibrant.
Graphical Method
1. Draw vectors to scale
2. Make parallelogram
3. Draw diagonal (resultant)
4. Find magnitude
Graphical Method
1. Measure length, Convert to Newtons using scale 1 cm = 1 N
2. Measure angle vector makes with horizontal
R = 4.5 N 53° N of E
E = 4.5 N 53° S of W
Choice 1 - Smaller the angle, larger the resultant
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
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