Ключевые слова: anonymous, balance, balls, blurred background, bounce, business, closeup, collision, concept, conservation, constant, copy space, cradle, crop, effect, energy, experiment, faceless, force, gravitation, gravity, hanging, horizontal, idea, infinite, kinetic, law, loop, man, metal, model, momentum, movement, newton, newton cradle, observation, observing, pendulum, perpetual, physics, precise, pulling, reaction, science, shiny, sphere, studio shot, swinging, symbol, unrecognizable,