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Mechanical Engineering QUESTION #2490
Question 1
In the contour method of kinetostatic analysis, a closed kinematic chain is converted into two open chains by:
  • Removing the ground link
  • Severing one kinematic pair and introducing reaction force unknowns at that pair✔️
  • Applying inertia forces to all links simultaneously
  • Setting all angular accelerations to zero
Correct Answer Explanation
The contour method 'mentally disconnects' the kinematic pair \(A_i\) between links \(i-1\) and \(i\), introducing unknown reaction forces \(\mathbf{F}_{i-1,i}\) and \(\mathbf{F}_{i,i-1}=-\mathbf{F}_{i-1,i}\). The closed chain becomes two open chains.