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Forces of 5 N and 15 N act on a body in opposite directions along the same line. What is the magnitude and direction of the resultant force?
A20 N along the 15 N force
B10 N along the 5 N force
C10 N along the 15 N force
D75 N along the 5 N force
Answer & Solution
Correct answer: C. 10 N along the 15 N force
1. For unlike parallel forces, F_net = larger − smaller = 15 − 5.
2. F_net = 10 N.
3. The resultant always acts along the greater force, here the 15 N force.
4. Rule out 20 N: that would be the sum, valid only if both acted in the same direction.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 1 "Laws of Motion", p.11_
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