Velocity.   Speed describes the rate of motion of an object. It is a scalar quantity (magnitude only)  Velocity describes the rate of motion AND the.

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Presentation transcript:

Velocity

  Speed describes the rate of motion of an object. It is a scalar quantity (magnitude only)  Velocity describes the rate of motion AND the direction of an object. It is a vector quantity (magnitude and direction). Speed vs. Velocity

  Distance travelled is a scalar quantity Δ d = 10m  Displacement is a vector quantity Δ d = 10m [right] Distance Traveled vs. displacement

  X-Axis Method  This method uses degrees counterclockwise  See page 139  Do Practice Problem #6  Navigator Method  This method uses N, S, E, W clockwise  See Page 140  Do Practice Problem #7 How to Identify Vector Directions

  When finding speed (scalar) use distance (scalar) ~ just magnitude  When finding velocity (vector) use displacement (vector) ~ both magnitude and direction Speed and Velocity

  Average velocity = displacement time elapsed = Δ d Δ t = d final – d initial t final – t initial **You must state magnitude and direction **Do practice problems Pg 141 #8-10 Velocity

  Plot time on the x-axis and position on the y-axis  A straight line (/) represents a linear relationship between position and time taken to travel it. It shows uniform motion.  Average velocity can be determined from the graph…  Slope = rise run = Δ d Δ t Look at example problem on Page 143 Do Practice problem #11 Position-Time Graph

  Time on the x-axis and velocity on the y-axis  A horizontal line(-) represents uniform velocity  An increasing line(/) represents acceleration and a decreasing line(\) represents deceleration  Distance can be calculated by finding the area under the line of best fit  Area under line = area of a rectangle = length x width Velocity-Time Graph

  Page 145 #1-8 Assignment