Summary1 - VECTOR Speed is the magnitude of the velocity...

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Kinematics: Objects in Motion Distance traveled Average Speed = ----------------------- Elapsed Time v s = d/ D t Units: Speed is measured in [m/s] Unit conversion: 1 mi = 1610 m 1 hr = 3600 s Instantaneous speed = speed at a given moment in time v s = d/ D t (for very small D t) Summary Lecture 1 s / m . hr mi mph 6 24 55 55 = = hr 1 s 3600 mi 1 m 1610

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Speed and Velocity To describe how (fast) a body is moving we need: 1. The speed of the object 2. The Reference Frame we have chosen to describe the motion 3. The direction of the object Define: Velocity = Speed + Direction
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Unformatted text preview: VECTOR Speed is the magnitude of the velocity vector. Speed is just a number with units SCALAR Displacement = distance from origin Displacement Average Velocity = -----------------------Elapsed Time x 2-x 1 D x v = ------- = -------t 2-t 1 D t Instantaneous velocity = velocity at a given moment in time v = D x/ D t (for very small D t) Note: v could be zero even is the average speed is not Note: velocity = change in position over change in time...
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Summary1 - VECTOR Speed is the magnitude of the velocity...

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