A-LevelMathematicsMechanics9709/43 · Oct/Nov 2017 · Q13 Marks
Three coplanar forces of magnitudes FN, 20 N and 30 N act at a point P, as shown in the diagram. The resultant of the three forces acts in a direction perpendicular to the force of magnitude FN. Find the value of F. [Figure 1.1]
- (a)Find the value of F.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- (X=) 20 cos 60 + 30 cos 60 - F
- [F = 20 cos 60 + 30 cos 60] M1 Use of horizontal component of resultant = 0
- F = 25 A1
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