Woman Watches Newton's Cradle Swing Back and Forth

A woman with long, straight, dark hair rests her elbows on a wooden table and looks at a Newton's cradle. The metallic balls swing back and forth. She wears a tan-colored sweater with a textured knit. The video is a close up shot, and the background is dark. This clip could be used in videos about physics, cause and effect, relaxation, or simple pleasures.