The Law of Conservation of Energy says that energy can't be made or destroyed. It can only change from one form to another. Here are some simple experiments to show this idea:

1. Pendulum Experiment:

   • Start by measuring how high the pendulum swings (that's the height, or $h$) and how fast it goes (that's the speed, or $v$) at different moments.
   • You can figure out two types of energy:
     • Kinetic energy (how much movement it has) can be found using the formula:
       $KE = \frac{1}{2}mv^2$
       (Here, $m$ is the mass of the pendulum.)
     • Potential energy (how much stored energy it has because of its height) can be found using this formula:
       $PE = mgh$
       (Again, $m$ is mass, $g$ is the pull of gravity, and $h$ is height.)
   • No matter what, the total energy stays the same!

2. Roller Coaster Model:

   • Watch how energy moves from potential energy when the coaster is at the top to kinetic energy as it goes down.

Both of these fun experiments show that energy can change forms but doesn’t disappear. This support the idea of conservation of energy!