A frame of reference is an abstract coordinate system with specified origin and scale. Reference points are identified mathematically and physically. In n dimensions, n+1 reference points are sufficient to define a frame
Speed is the magnitude of position change over time, a non-negative scalar quantity. Speed is the rate at which an object covers distance. Galileo first defined speed as distance covered per unit of time
Work is energy transferred via force application along a displacement. Work equals force multiplied by distance traveled. Force doing work is positive when in same direction as displacement. Work is scalar quantity with only magnitude
Fish fins are movable appendages that generate thrust and help swim. Most fins are unpaired (dorsal, anal, caudal) and paired (pectoral, pelvic). Fins are supported only by muscles, not directly connected to back bone
Velocity is defined by magnitude and direction. Initial velocity is speed and direction at beginning of travel. Proper equation selection crucial for solving physics problems
Velocity is an object's speed in a specific direction. Velocity equals displacement divided by time. Velocity includes direction, unlike speed which only measures distance