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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.
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?

Jan 2006

 

 

 

 

 

 

Choice 1 -

Smaller the angle,

larger the resultant

 

 

 

Monster Shoot Out Game

St. Mary H.S. Physics

 

 

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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