1lb Painted Metal Inertia Ball with 3 Eye Bolts Type_Cross-Sectional configurable as a heavy pendulum

configurable as a heavy pendulum bob or a demonstration mass for Newton's-first-law setups

Mid-size 3 x 1

Quarter-scale full-body muscular model at 18 inches tall shows superficial muscle groups in anatomical position

this sonometer carries brass and steel wires across a 114cm wooden box with two millimetre rules

housed in a vinyl-covered zinc steel case

1lb Painted Metal Inertia Ball with 3 Eye Bolts Type_Cross-Sectional configurable as a heavy pendulumOne pound metal ball painted black with three fixed eyebolts of 3 8 inch inner diameter, configurable as a heavy pendulum bob or a demonstration mass for Newton's first law setups.