Scientists use different kinds of investigations depending on the questions they are trying to answer. Simple instruments, like rulers and magnifiers, provide more information than scientists obtain using only their senses. Scientists develop explanations using observations and what they already know about the world. Good explanations are based on evidence from investigations. Scientists make the results of their investigations public.
Scientists review and ask questions about the results of other scientists' work.
Physical Science Properties of objects and materials Objects have observable properties, including size, weight, shape, and color. Objects are made of one or more materials and can be described by the properties from which they are made. Some common materials, such as water, can be changed from one state to another. Position and motion of objects An object's motion can be described by tracing and measuring its position over time. The position of an object can be described by locating it relative to another object.