Alnico Cylindrical Magnet, 37 x 9mm Material_Copper heating the bar until it

heating the bar until it no longer passes through the opening and contraction returns it

this magnified animal cell model reveals organelle ultrastructure and cellular organization for advanced biology instruction

Hand-cranked cam turning against both a straight follower and a lever follower

equipping a class for compound-pulley and multi-rope mechanical-advantage experiments

Hooke's Law

Alnico Cylindrical Magnet, 37 x 9mm Material_Copper heating the bar until itPink dots mark opposing poles on this 37 x 9mm Alnico cylinder pair, supplied with steel keepers and a cardboard storage box for sustained field strength between hands on experiments.