Question

3. A block on a level surface is attached to one end of a spring, as shown in the figure above. The other end of the spring is attached to a wall. There is friction between the block and the surface. A person displaces the block from its equilibrium position and releases it. Which of the following shows the mechanical energy E as a function of time t for the system that includes only the block and the system that includes the block and spring? (2) (Select one) (A) EBlock (C) Elock EBlock and Spring EBlock and Spring of (B) Eplock EBlock and Spring (D) Eglisk EBlosk and Spring /20
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Answer #1

The correct option is (D)

In this case, there exist a restoring force acting on the oscillating object. The direction of this force must always point toward the equilibrium. As the time passes, the oscillations are decreases. It represents that the graph beween energy of block and time is oscillatory decay.

In the same time, the energy of spring block system is exponentialy decay with time.

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