11.1 Distance and Displacement Frame of reference: object used to describe motion Relative motion: movement in relation to frame of reference Measuring Distance: length of path between 2 points Measuring Displacement: direction (using straight line) from starting to ending point

Displacement Straight path Not straight path Same direction add magnitudes Opposite direction subtract magnitudes Not straight path Resultant vector (if multiple directions) gives vector sum, like a graph

11.2 Speed and Velocity Speed (v)= distance (d) / time (t) Avg: duration of trip Instantaneous: particular instant Graphing Motion Slope of the line= speed

Velocity Combining velocities Both speed and direction It’s a vector Add together like vector addition

11.3 Acceleration Acceleration: change in speed, direction, or both Changes in Speed Speeding up and slowing down are acceleration Freefall: move of object towards earth because of gravity (9.8m/s2) Changes in Direction Speed can be constant but change in direction Ex rides that spin Changes in Speed and Direction Ex roller coaster

Constant acceleration: steady change in velocity, ex: jet Calculating Acceleration: Change in velocity/ total time; a= (vf – vi) / t Speed-Time Graphs: linear Distance-Time Graphs: nonlinear Instantaneous Acceleration: how fast velocity is changing at specific acceleration