How Do Weight Scales Work?
Spring Scales Spring scales measure the force an object puts on the spring. The spring inside of the scale (vertical scale) will repel against the weight put on it. The total distance of this repelling determines the measurement on the spring scale. The spring is attached to a hook. The item to be weighed (such as a basket of fruit in the supermarket) is placed on the hook. The measurement works as a result of gravity pulling on the object, which then pulls on the spring. A pinion converts the vertical movement of the spring into a circular motion, resulting in an arrow turning a reading on the dial. Balance Scales Balance scales measure the mass of an object. A horizontal lever sits between the testing weight and a predetermined weight. The difference between the weight of the person or object and the predetermined weight mechanism determines the measurement on the balance scale. A typical balance scale is constructed of a horizontal lever (rod/bar) that is suspended horizontally from
