As you can see here, there is a ferris wheel in the background that is not in motion. That is Newton's first law! Newton's first law states that something at rest will remain at rest unless an unbalanced force comes into play!
Here you can see these waves are in motion and will remain in motion until there is an unbalanced force, such as high, strong winds.
In this example, these girls are sitting down and are not in motion. They won't be in motion until there is an unbalanced force.