Lecture on getting the resultant using polygon method

1. Getting Vector
Resultant Using
Polygon Method

2. Example #1
O Erik walks 600m East, then turns 400m North
and finally walks 300mWest. Find its
resultant vector. (Scale: 1 cm : 100m)
A = 600m
B=400m
C = 300m
54°

3. Assignment#1
OA hiker walks 50m East, then 200m South and
finally 400m West. What is the resultant
displacement of the hiker from starting point?
(Scale 1cm = 50m)
A = 50m
B=200m
C = 400m

4. Vector Resolution
O Same Direction
O Opposite Direction
O Pythagorean Theorem
O Component Method

5. Same Direction
O Example:
A = 20m/s East
B = 20m/s East

6. Opposite Direction
O Example:
A = 15m North
B = 28m South

7. Pythagorean Theorem
O Example:
A = 6 newtons E
B = 5 newtons N

8. Component Method
O An ant crawls on a tabletop. It moves 2cm
East, turns 3cm 40ºNorth of East and
finally moves 2.5cm North. What is the
ant’s total displacement?