When doesn't 100 + 100 = 200?

Vector Addition - The Setup

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Video Instruction

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B. Combining Force Vectors

Resultant- single vector that will have the same effect as two or more vectors

2 + 2 = 4 Right???

Sometimes !!!!!

Not always true
with vectors

Sometimes

2 + 2 = 0

1) Finding Resultants.

Case I - Forces acting in same direction

(Angle = 0 degrees)

Resultant = 9 N East

Is resultant different than the one above?

RULE when Ө = 0°

Add Forces

Case II - Forces acting in opposite direction (Angle = 180°)

Resultant = 40 N East

If Ө = 180°

Subtract smaller vector
from larger