PREFACE OF MOTION AND FORCE

MOTION IS EVERYWHERE. We Walk to class. We drive to the store. Bird fly. The wind blows the trees. The rivers flow. Even the continents drift. In the larger environment the Earth revolves on its axis. The Sun moves in the galaxy. The galaxies moves with respect to one another.

This section focuses on the description of motion in our environment, with definition and discussion of terms such as speed, velocity, and acceleration. We will then move on to forces .

Two basic kinds of motion are straight-line motion and uniformed circular motion. We experience examples of these each day. For instance, we know that driving around a curve gives a different sensation from driving in a straight line. Understanding acceleration is the key to understanding these basic kinds of motion.

What is force all about? What stops force? These are the kind of questions that will answered in this section. We will center our effort on Newton's three laws, momentum, inertia, mass and weight, and gravitation.