1. As a pendulum goes back and forth, it also goes up and down a little bit. But let's ignore the up and down motion. When is the acceleration of a pendulum the largest?
A. When it is at the middle (position A)
B. When it is at the largest displacement (position B)
C. Somewhere between A and B
D. The acceleration is constant.

2. When is the energy of a pendulum (the sum of the kinetic and potential energies) the largest?
A. When it is at the middle (position A)
B. When it is at the largest displacement (position B)
C. Somewhere between A and B
D. The energy is constant.

3. Discussion question: There are many devices and systems around the house, at work, or in the car that will vibrate when disturbed. List several of these; for one of these, explain the roles played by the various kinds of energy.

4. Discussion question: It is frequently useful to use something that can bend or twist or stretch to store elastic energy (this is the most common use of springs). Give some examples, and explain how the energy gets into the spring and what it is used for later.

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