2. External & Internal Force
: Force applied from outsideExternal force
Internal Force
:
: Force derived in inside
F F
N
FF
N
Virtual cut
a pair of same intensity and opposite direction forces
N = F 2/3
3. How much is Internal Force?
FC
FB
CBA
x
y
FA
FA FB FC+ = 0+ FA = FB FC+
NAB NBC
FA + NAB = 0 NAB
FB FC
+=
NBC + FC = 0 NBC = FC
3/3