Answers and Explanations

Review Questions

1. B
   Hooke’s law states that the force is proportional to the stretch (displacement).
2. E
   
3. D

   The work done by the spring is equal to the area under the F vs. x graph from 0.2 m to 0.3 m, which is

   
4. C
   The period (and thus the frequency) is not affected by a change in amplitude, only a change in length or gravity.
5. A
   The acceleration is the greatest at the same point where the restoring force is the greatest: at the amplitude.
6. D
   At point B, the equilibrium position, all of the energy is kinetic (100 J).