1. Motion of an object is described by its position , speed , direction , and acceleration. 2) MKS units are M eters, K ilograms S econds. 3. Initial means “ first ” or “ starting ”. 4 . D = “ delta ” D means “ the change in ” 5. D = final – initial.

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1. Motion of an object is described by its position ,

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4.3Velocity 32. Speed is a scalar; and Velocity is a vector.

4.3Velocity Constant Velocity 33. Constant velocity means traveling in a straight line at constant speed.

4.3Velocity Changing Velocity 34. Velocity changes if speed changes or direction changes or both change .

4.3Velocity The car on the circular track may have a constant speed but not a constant velocity, because its direction of motion is changing every instant.