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scalar quantity - A quantity in physics, such as mass (m), distance (d), time (t), speed (v), temperature (T) , that can be completely specified by its magnitude, and has no direction. A vector quantity - a quantity that has both magnitude and direction. Displacement (d), velocity (v), and acceleration (a) distance - Distance = d , which = meters (m) Speed - Speed = v = meters/s (m/s) Time - Time = t = seconds (s) distance definition - The amount of space between two objects or how far a particular object travelled over a certain time interval. Measured in (cm), metres (m), or kilometres ( km) Time definition - T, the duration between two events. Usually measured in seconds, minutes, or hours Speed - V, refers to the distance covered in a time interval. Formula for speed - s=d/t or speed= distance/ time instantaneous speed - the speed of an object at one instant of time Constant speed - Moving at a steady rate over time Displacement - the change in position of an object displacement formula - Delta d= d2 - d1delta d is the change in position d2 is the final position with reference to a point d1 is the initial position with reference to a point Calculations involving vectors - When doing calculations involving vectors you must always consider the direction. For instance, a positive value should be assigned to east. north, up, and towards the right. While negative values should be assigned to west, south, down and towards the left. Velocity - Represents the change in position over a particular time interval. V= delta d/ delta t Acceleration - a, describes all situations in which an objects speed is changing.