Engineering Board Exam Reviewer · Engineering Mechanics · medium
When drawing an FBD of a two-body system where Body A rests on Body B, the contact force that Body B exerts on Body A should be:
- Included on Body A's FBD, directed away from B, consistent with Newton's third law
- Excluded from Body A's FBD, since it is an internal force
- Included on both bodies with the same direction
- Represented as a moment rather than a force
Answer
A. Included on Body A's FBD, directed away from B, consistent with Newton's third law
Solution
The contact force is an external force on Body A (from A's perspective) and must be included on A's own FBD, distinct from the equal-and-opposite reaction it exerts on B.
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