This is an interesting demonstration of Newton's First Law of Motion (Law of Inertia) since the results are counterintuitive. Suspend the ball from the ceiling using one eyelet. Attach another string to a second eyelet. What happens when you pull steadily on the lower string? What happens if you jerk the lower string quickly? Our heavy ball can also be used as a pendulum bob. Includes heavy chrome plated steel ball with a mass of over 454 grams, drilled both ends; three eyebolts; safety loop on sides; instructions. String is not included.