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Which of the following mechanisms are examples of force closed kinematic Pairs?
A. Cam and roller mechanism
B. Door-closing mechanism
C. Slider-crank mechanism
- a)A and B only
- b)A and C only
- c)B and C only
- d)A, B and C
Correct answer is option 'A'. Can you explain this answer?
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Which of the following mechanisms are examples of force closed kinemat...
Self-closed pair:
When the two elements of a pair are connected together mechanically. The contact between the two can be broken only by destruction of at least one of the members.
All lower pairs and some higher pairs are closed pairs. Sliding pairs, turning pairs, spherical pairs and screw pairs are also closed pairs.
Forced-closed pair:
When two links of a pair are in contact either due to force of gravity or some spring action. In this, the links are not held together mechanically e.g. cam and follower pair (because spring is used to keep the motion constrained).
Slider-crank mechanism does not require such force.
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Which of the following mechanisms are examples of force closed kinemat...
Understanding Force Closed Kinematic Pairs
Force closed kinematic pairs are mechanisms where the motion is constrained by physical contact, ensuring a definite relationship between the movement of linked components. Let's analyze the given options.
Option A: Cam and Roller Mechanism
- The cam and roller mechanism is a classic example of a force closed kinematic pair.
- The cam's contour dictates the motion of the roller, which maintains contact throughout the motion.
- This relationship ensures precise control over the movement, making it a perfect representation of force closure.
Option B: Door-Closing Mechanism
- A door-closing mechanism involves various components like hinges and springs.
- Although the door's movement is constrained, it does not represent a continuous force closed kinematic pair.
- The motion may be influenced by external forces (e.g., wind), which can alter the interaction.
Option C: Slider-Crank Mechanism
- The slider-crank mechanism facilitates the conversion of rotary motion to linear motion.
- While it operates under constraints, it does not maintain continuous force closure like the cam and roller.
- The slider can experience changes in position and alignment due to varying forces, which means it is not a true force closed pair.
Conclusion
- The only accurate example of a force closed kinematic pair among the options is the cam and roller mechanism (Option A).
- Both the door-closing and slider-crank mechanisms lack the continuous, constrained motion characteristic of true force closed kinematic pairs.
Therefore, the correct answer is option 'A'.
Force closed kinematic pairs are mechanisms where the motion is constrained by physical contact, ensuring a definite relationship between the movement of linked components. Let's analyze the given options.
Option A: Cam and Roller Mechanism
- The cam and roller mechanism is a classic example of a force closed kinematic pair.
- The cam's contour dictates the motion of the roller, which maintains contact throughout the motion.
- This relationship ensures precise control over the movement, making it a perfect representation of force closure.
Option B: Door-Closing Mechanism
- A door-closing mechanism involves various components like hinges and springs.
- Although the door's movement is constrained, it does not represent a continuous force closed kinematic pair.
- The motion may be influenced by external forces (e.g., wind), which can alter the interaction.
Option C: Slider-Crank Mechanism
- The slider-crank mechanism facilitates the conversion of rotary motion to linear motion.
- While it operates under constraints, it does not maintain continuous force closure like the cam and roller.
- The slider can experience changes in position and alignment due to varying forces, which means it is not a true force closed pair.
Conclusion
- The only accurate example of a force closed kinematic pair among the options is the cam and roller mechanism (Option A).
- Both the door-closing and slider-crank mechanisms lack the continuous, constrained motion characteristic of true force closed kinematic pairs.
Therefore, the correct answer is option 'A'.
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Which of the following mechanisms are examples of force closed kinematic Pairs?A. Cam and roller mechanismB. Door-closing mechanismC. Slider-crank mechanisma)A and B onlyb)A and C onlyc)B and C onlyd)A, B and CCorrect answer is option 'A'. Can you explain this answer?
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