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.
The external air pressure keeps the ball in place.
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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.
Angle not 90 degrees, can't use
Pythagorean theorem
Graphical Method
1. Draw vectors to scale
2. Make parallelogram
3. Draw diagonal (resultant)
4. Find magnitude
& direction of vector
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
Which pair of vectors has the greatest resultant?
Choice 1 -
Smaller the angle,
larger the resultant
St. Mary H.S. Physics
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Resultants - Head to Tail |
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