This document discusses forces and their effects. It begins by defining a force as a push or pull and discusses different types of forces. It then explains how forces can affect motion by changing an object's speed, direction of motion, or state of rest. Methods for accurately measuring length, time, speed and acceleration are also presented. Distance-time graphs are introduced and examples of calculating speed from these graphs are shown. Finally, the concept of moment of a force is defined and everyday examples like opening a door are described.