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The gravitational unit of force, one kilogram force (kgf), is equal to
A9.8 N
B980 N
C9.8 dyne
D1 N
Answer & Solution
Correct answer: A. 9.8 N
1. 1 kgf = 1 kg x g, where g = 9.8 m s⁻².
2. Substitute: 1 kgf = 1 x 9.8 = 9.8 kg m s⁻².
3. So 1 kgf = 9.8 N.
4. Rule out 980 N: 980 belongs to 1 gf = 980 dyne in the CGS system, not newtons.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 1 "Laws of Motion", p.14_
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