Forces act as indicated on a rod AB which is pivoted at A. Find the anticlockwise moment of each force about the pivot.

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Solution

Magnitude of force: $2 F$ $F$ $3 F$
Perpendicular distance from A: $a$ $2 a$ $4 a sin 30^{\circ} = 2 a$
Anticlockwise moment about A: $+ 2 F a$ $- 2 F a$ $+ 6 F a$

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Magnitude of force:	$2 F$	$F$	$3 F$
Perpendicular distance from A:	$a$	$2 a$	$4 a sin 30^{\circ} = 2 a$
Anticlockwise moment about A:	$+ 2 F a$	$- 2 F a$	$+ 6 F a$

Forces act as indicated on a rod AB which is pivoted at A. Find the anticlockwise moment of each force about the pivot.

Magnitude of force:2F F 3FPerpendicular distance from A: a 2a 4asin30∘=2aAnticlockwise moment about A: +2Fa −2Fa +6Fa

Magnitude of force: $2 F$ $F$ $3 F$
Perpendicular distance from A: $a$ $2 a$ $4 a sin 30^{\circ} = 2 a$
Anticlockwise moment about A: $+ 2 F a$ $- 2 F a$ $+ 6 F a$