sentence: Spring scales are made with the assumption that they are being used on the surface of the Earth.
sentences_before: The weight of an object, or of an amount of matter, is typically measured with an instrument such as a spring scale. The scale includes a spring which provides a force to oppose the gravitational force on the object which is being weighed. The gravitational force pulls down, the spring pushes or pulls upwards.
sentences_after: If a spring scale was taken to the Moon it would give a misleading reading.
concept_name: spring scale
headings: Weight Measuring weight
categories: Measurement Basic English 850 words