Interaction of Matter, Space and Time The building blocks Physicists have identified 13 building blocks that are the fundamental constituents of matter. Our everyday world is made of just three of these building blocks: the up quark, the down quark and the electron. This set of particles is all that’s needed to make protons ….  Read More

      Fundamentals and Derived Quantities and Units.     Physical Quantities and Units LEARNING OBJECTIVES By the end of this section, you will be able to: Perform unit conversions both in the SI and English units. Explain the most common prefixes in the SI units and be able to write them in scientific ….  Read More