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To simplify the analysis of two-dimensional collisions, the source restricts attention to point masses. What is a point mass?
AAny object with a mass smaller than one kilogram
BA structureless particle that cannot rotate or spin
CAn object that only exists in one dimension
DA particle that has no momentum at all
Answer & Solution
Correct answer: B. A structureless particle that cannot rotate or spin
1. The source introduces point masses to avoid the complication of objects rotating during or after a collision.
2. A point mass is a structureless particle that cannot rotate or spin.
3. This has nothing to do with a specific numeric mass value, and it is still analyzed as moving through ordinary two-dimensional space, not confined to one dimension.
4. A point mass can absolutely carry momentum, since it still has mass and velocity like any other object in this material.
_Source: OpenStax College Physics (CC BY 4.0), Ch 8 "Linear Momentum and Collisions", section 8.6 Collisions of Point Masses in Two Dimensions_
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