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Which statement is Newton's third law of motion?
AWhen one body pushes a second, it feels an equal opposite force
BThe acceleration of a body is set by the force and the mass
CA body keeps its velocity unless a net force acts on it
DEvery body attracts every other body across empty space
Answer & Solution
Correct answer: A. When one body pushes a second, it feels an equal opposite force
1. Whenever one body exerts a force on a second body, the first experiences a force in return.
2. That returned force is equal in magnitude and opposite in direction to the one exerted.
3. Forces therefore always occur in pairs, which is the symmetry the law captures.
4. The statements about velocity and about acceleration are the first and second laws.
_Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.4 Newton's Third Law of Motion: Symmetry in Forces_
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