We begin by considering the forces exerted on a ring that is connected to a spring and that is free to slide along a rod. (See the top view diagram at right.)
Assume that the ring is massless and that the rod is frictionless.
- What is the n, force on the ring? (Hint: Consider what happens to the net force on an object as its mass approaches zero.) Explain.
Does the net force on a massless ring depend on the acceleration of the ring? Explain
What is the magnitude of the gravitational force exerted on the ring? (Recall that the ring is massless.)
Check that your free-body diagram is consistent with your answers to pans i and ii.
Would your answer above differ if you considered an instant when the free end was not at its farthest point from its equilibrium position? Explain.
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