A bungee jumper momentarily comes to rest at the bottom of the dive before he springs back upward. At that moment, is the bungee jumper in equilibrium? Explain.
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The rope of bungee jumping is like a spring.
When the net force acting on an object is zero the object is said to be in translational equilibrium. The bungee jumping rope is like a spring. When the load is suspended, the rope stretches until the net force acting on the object is zero. When the weight of the object W and restoring force of the spring F is equal the object comes to rest. This point is the lowest point of the bungee jumper, there the object is in equilibrium.
W; the weight of hanging mass
F1; the restoring force of the spring in the second picture.
F2; the restoring force of the spring at final position.
In the first position, the spring is unstreched with no hanging mass .
In the second position, the released mass pulls the spring down;
In the last position, the spring reaches the final position and stops ;