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Friction is defined in the study of Newton's laws as which of the following?
AA force that pulls two touching objects towards each other
BA force that opposes motion past each other of touching objects
CA force that acts perpendicular to the surface of contact
DA force that acts only while an object is at rest
Answer & Solution
Correct answer: B. A force that opposes motion past each other of touching objects
1. Friction is a force that opposes the motion past each other of objects that are touching.
2. It therefore acts along the surface of contact rather than across it.
3. A force acting perpendicular to the surface of contact is the normal force instead.
4. Air resistance is another example of the same opposing behaviour.
_Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.3 Newton's Second Law of Motion: Concept of a System_
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