A non-contact force is one that:
AActs only when objects touch
BCannot be measured
CHas no SI unit
DActs at a distance without contact
Answer & Solution
Correct answer: A. Acts only when objects touch
1. Non-contact forces operate across empty space.
2. Examples include gravity, electrostatic and magnetic forces.
3. They need no physical contact between bodies.
4. So a non-contact force acts at a distance.
_Source: Selina Concise Physics ICSE Class 8, Ch 3 'Force and Pressure'_
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