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Mechanical Engineering QUESTION #2489
Question 1
A 'force-closed kinematic pair' such as a cam-follower system requires an external force (spring, gravity) to maintain contact. A 'form-closed kinematic pair' maintains contact by:
  • Friction forces only
  • Geometric constraint (shape of the pair elements)✔️
  • Electromagnetic forces
  • Lubrication pressure
Correct Answer Explanation
A form-closed (geometry-closed) kinematic pair is held together by the geometry of its elements, such as a pin in a hole or a slider in a two-sided slot. No external force is needed.