physics quantities and systems of units to learn useful in 2020

February 09, 2020

physics quantities and systems of units to study easy

physics quantities and systems of units to study easy
Physics is one of the most fundamental of the sciences


Study of physics is also an adventure.

    Physics is one of the most fundamental of the sciences. Scientists of all dis- ciplines use the ideas of physics, including chemists who study the struc- ture of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physics.

   The study of physics is also an adventure. You will find it challenging, sometimes frustrating, occasionally painful, and often richly rewarding. If you’ve ever wondered why the sky is blue, how radio waves can travel through empty space, or how a satellite stays in orbit, you can find the answers by using fundamental physics. You will come to see physics as a towering achievement of the human intellect in its quest to understand our world and ourselves.
In this opening chapter, we’ll go over some important preliminaries that we’ll need throughout our study. We’ll discuss the nature of physical theory and the use of idealized models to represent physical systems. We’ll introduce the systems of units used to describe physical quantities and discuss ways to describe the accuracy of a number. We’ll look at examples of problems for which we can’t (or don’t want to) find a precise answer, but for which rough estimates can be useful and interesting. Finally, we’ll study several aspects of vectors and vector algebra. Vectors will be needed throughout our study of physics to describe and analyze physical quantities, such as velocity and force, that have direction as well as magnitude.

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