Students measure the mass of an object based on oscillation rather tha Earth's gravity.

• Three masses change the oscillation rate
• Balance clamps conveniently to the edge of a table
• Discuss the difference between gravitational mass and inertial mass

A demonstration kit for the comparison of "mass" vs. "weight". A platform is supported on spring-steel strips which is made to oscillate in the horizontal plane under various loads. Two trays, 130×50 mm, help approximately 200 mm apart. One tray has holes to take the three equal mass cylinders of size 100 mm length and 2 mm diameter. Three support pins to fit inside the cylinders are included.