How are kinematic pairs defined based on their contact characteristics__________________?
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Answer: D. two elements that permit relative mo-tion
Explanation
Kinematic pairs are fundamentally defined as two elements that permit relative motion between them. This relative motion constraint distinguishes mechanical linkages from rigid standalone structural components. The connection allows specific degrees of freedom while restricting unwanted spatial movements. Kinematics focuses on motion without considering the forces causing that motion. Pairs are classified by contact type into lower pairs and higher pairs. Understanding kinematic pairs helps engineers analyze mechanisms using mobility and Grubler's criteria.
Robotic arms use various kinematic pairs to achieve flexible multi-axis movement in manufacturing plants. Automotive steering systems rely on connected kinematic pairs to translate driver input to wheels. Hinges on doors and windows represent everyday examples of basic turning kinematic pairs. Option A describes higher pairs specifically, rather than the general definition of kinematic pairs. Option B describes lower pairs with surface contact, which is a subcategory of pairs. Option C incorrectly describes unconstrained elements that do not form a proper kinematic pair.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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