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You can do this with a ping pong ball and a hair dryer

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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Quick Resultants Review

Opp. Direction - Subtract

90 degrees - Pyth.

A. Resultants - Angle ≠ 90°

Find Fy and Fx of resultant

Find Fy and Fx of resultant

Fx = 4N - 3N = 1N

Fy = 3N - 1N = 2N

Ex) 5 N North & 3 N 30° S of E act concurrently (on a single point).

Find the Fx and Fy
of resultant in terms of theta

1. Sketch Vectors

1. Combine Fx and Fy

ΣFx = 0 + 3Ncos30

ΣFx = 2.6 N

ΣFy = 5N - 3 Nsin30

ΣFy = 3.5 N

Pyth. Theorem and Tangent

R = 4.5 N 53° N of E

E = 4.5 N 53° S of W

 Ranking Task Rank the resultants from SMALLEST to LARGEST

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.

Increases