Our Hooke's Law apparatus as featured in the NSTA Science Scope article "Tried and True: Springing Into Linear Models" available in the September 2012 issue of NSTA Science Scope. This apparatus is used to verify Hooke's Law that the elongation of a spring is directly proportional to the force applied. This apparatus features heavy duty steel construction and has a small footprint for use where space is limited. A 12cm scale and a 14 PIECE SLOTTED WEIGHT SET (10g/0.1N and 20g/0.2N) are included. The 3cm spring lengthens 7mm for each 10 grams of weight applied. SPECIFICATIONS Slotted Masses Included: 14 Total Qty 8 of 20g / 0.2N Qty 6 of 10g / 0.1N Dimensions (l x w x h): 5" x 4" x 13" 12.5cm x 10cm x 33.5cm Product Weight: 1.45 lbs.