Presumably you are watching the behaviour of water running down a vertical surface such as a window pane or a bathtub.
Here is your chance to be a scientist. Try the experiment with a oily surface, and a washed surface, and a cleaned surface, and draw your conclusions.
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Water appears to "wiggle" due to the movement of its molecules, which are constantly vibrating and moving. This movement is caused by the thermal energy present in the water, which makes the molecules bounce around and collide with each other. Additionally, wave motion and other disturbances in the water can also contribute to its wiggling appearance.
A wiggle in time is often referred to as a vibration or oscillation. It represents a repeated back-and-forth movement around a central point in time.
When you wiggle a pencil, the light hitting it bends and distorts due to the pencil's movement. This distortion creates the illusion of the pencil looking rubbery due to the way our eyes perceive the light changes during the motion.
Try using soap and water to make the finger slippery. Then, gently twist and wiggle the ring while pulling it off. If that doesn't work, seek help from a professional jeweler.
A wiggle in time and space is called a spacetime fluctuation. This term is often used in physics to describe small changes or disturbances in the fabric of spacetime itself, which can affect the behavior of particles and objects within it.
The medium of a wave is the matter a wave travels through.So yeah, if you wiggle a rope, the medium isn't the air around the rope... the medium is the rope itself!