Chapter 11 Most Missed Topics Velocity and Acceleration.

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Presentation transcript:

Chapter 11 Most Missed Topics Velocity and Acceleration

Equations Speed = distance / time units: m/s Distance = speed x time Time = distance / speed Velocity = displacement / timeunits: m/s Displacement = velocity x time Time = displacement / velocity Acceleration = change in velocity / timeunits: m/s 2 Change in velocity = acceleration x time Time = change in velocity / acceleration ** change in velocity = final velocity – initial velocity

Graphing Time is ALWAYS placed on the x-axis because it is the independent variable Distance or velocity is placed on the y-axis because it is the dependent variable On a distance vs. time graph, the slope of the line is equal to the object’s speed (or velocity, in instances where the distance is equal to the displacement) On a velocity vs. time graph, the slope of the line is equal to the object’s acceleration

Scalar vs. Vector A scalar is a measurement that can be represented with only numerical values Distance and speed are scalars A vector is a measurement that must have both magnitude AND direction Displacement and velocity are vectors Displacement is the change in position of an object (difference between the starting and ending points)—it must be in a particular direction, and it must be a straight line