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Contact forces such as tension, friction and the normal force are said to result from:
AGravitational attraction
BNuclear binding energy
CMagnetic field lines
DInteratomic electric forces
Answer & Solution
Correct answer: D. Interatomic electric forces
1. Everyday pushes and pulls have a microscopic origin.
2. Contact forces include tension, friction, the normal force and spring forces.
3. These result from interatomic electric forces.
4. That happens at the microscopic level.
5. So contact forces are electrical in origin.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_
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