Question 2
Two forces act on a
circular disc as shown.
Which diagram shows the line of action of the
resultant force?
Reference: Past Exam Paper – June 2017 Paper 12 Q2
Solution:
Answer:
A.
The resultant force of the
perpendicular forces 3 N and 4 N can be easily obtained by considering the
triangle formed.
Resultant force = √(32+42) = 5 N
The resultant force would
be located at the point where the line of action of both forces act. The line
of action of the 3 N force is vertical while the line of action of the 4 N
force. The lines of action cross at the centre of the disc. [B and D are
incorrect]
Since the both forces (3 N
and 4 N) are not equal, the direction of the resultant force cannot be exactly
between them. Here, the resultant force is closer to the 4 N force (since it is
larger). [A is correct]
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