Info

Choosing A Frame Of Reference -to describe motion accurately and completely, a frame of reference is necessary

Measuring Displacements -distance is the length of the path between two points. displacement is the direction from the starting point and the length of a straight line from the starting point to the ending point

Combining Displacements -add displacements using vector addition

Speed -average speed is computed for the entire duration of a trip, and instantaneous speed is measured at a particular instant

Average speed = total distance, or v = d total time t

EXAMPLE- total distance (d) = 35km + 53km = 88km total time (t) = 0.4h +0.6h = 1h average speed (v) = ?

v = d v=88km = 88km/h t 1 hr

Graphing Motion -the slope of a line on a distance-time graph is speed

Velocity -velocity is a description of both speed and direction of motion. velocity is a vector

Combining Velocities -two or more velocities add by vector addition

What Is Acceleration? -acceleration can be described as changes in speed, changes in direction, or changes in both. acceleration is a vector

Acceleration = change in velocity = (vf - vi) total time t EXAMPLE- time = 2 seconds starting velocity = 0 m/s ending velocity = 6m/s acceleration = ?

a = (vf - vi) t acceleration = (6 m/s - 0 m/s) = 3 m/s down the ramp 2 s

Graphs Of Accelerated Motion -the slope of a speed-time graph is acceleration

Instantaneous Acceleration -instantaneous acceleration is how fast a velocity is changing at a specific speed