Multiple ForcesMediumQuestion 30249
Question
Forces 3 N, 4 N, and 5 N act at a point. The 3 N and 4 N are perpendicular. For equilibrium with the 5 N force, the 5 N force must be:
- AParallel to the resultant of 3 N and 4 N
- BOpposite to the resultant of 3 N and 4 NCorrect
- CAt 45° to both
- DDirected vertically upward
Correct answer
Opposite to the resultant of 3 N and 4 N
Explanation
The resultant of 3 N ⊥ 4 N is √(9+16) = 5 N. For equilibrium, the 5 N force must be equal and opposite to this resultant.