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Chapter03

# Chapter03 - Chapter3:MotioninTwoor ThreeDimensions 1....

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Chapter 3 : Motion in Two or  Three Dimensions

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Motion of a particle in space Position : Displacement : Average velocity: Instantaneous velocity 1. Position and Velocity Vectors One dimension Position: x coordinate
A velocity in the xy -plane can be decomposed into separate x and y components. Direction is the tangential direction of the path. Trigonometry will aid the determination.

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2. Acceleration Vector Average acceleration: Instantaneous acceleration
The acceleration vector can result in a change in either the magnitude OR the direction of the velocity.

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The figure shows velocity and acceleration as time passes.
Direction of acceleration with respect to velocity Parallel and perpendicular components of acceleration a r a r

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Velocity and acceleration vectors for a particle moving on a curved path Notice the acceleration vector change as velocity decreases, remains the same, or increases.
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