AE2103 – Kinematics and Dynamics
Work and Energy
1. The 20-kg rod is released from rest when θ = 0⁰. Determine its angular velocity when
θ = 90⁰. The spring has an unstrechted of 0.5 m.
Figure for Problem 1.
2. A spring having a stiffness of k = 300 N/m is attached to the end of the 15-kg rod, and it is
unstrecthed when θ = 0⁰. If the rod is released from res when θ = 0⁰, determine its angular
velocity at the instant θ = 30⁰. The motion is in the vertical plane.
Figure for Problem 2.
3. The 6-kg rod ABC is connected to the 3-kg rod CD. If the system is released from rest
when θ = 0⁰, determine the angular velocity of rod ABC at the instant it becomes horizontal.
