Final answer:
To demonstrate the law of conservation of energy, you can construct an energy chain by showing the conversion of potential energy into kinetic energy in a simple pendulum.
Step-by-step explanation:
The law of conservation of energy states that energy cannot be created or destroyed; it can only be transferred or transformed from one form to another. To construct an energy chain demonstrating this law, you can choose option 1: Create an energy chain by showing the conversion of potential energy into kinetic energy in a simple pendulum. This example involves the transformation of gravitational potential energy into kinetic energy and vice versa as the pendulum swings back and forth.