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L2-Motion-2

# L2-Motion-2 - Lecture 2 Motion-2 Dr Amr Aboshousha PHCM...

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Dr. Amr Aboshousha PHCM 212-IG group 1 Lecture 2: Motion-2

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Dr. Amr Aboshousha PHCM 212-IG group 2 Motion with Changing Velocity Acceleration The velocity is a vector quantity, it has both magnitude and direction. Any change in the magnitude or in the direction of the velocity results in acceleration. The Acceleration is defined as the rate of change of the velocity. It is a vector quantity and has a unit of m/s 2 . The average acceleration is found as . Where v is the change of velocity during the time interval t.
Dr. Amr Aboshousha PHCM 212-IG group 3 •E x a m p l e A racing car reaches 100 km/hr from rest within 3 sec., when accelerating in a straight line. Calculate its acceleration. Sol. v = final velocity – initial velocity = v – v o = 100 – 0 = = 100 km/hr = 100 x (10 3 /(60x60)) = 27.78 m/s . t = 3 s. So, Notice here the + sign of the acceleration that shows the increase of the velocity. The acceleration is –ve and is called a deceleration whenever it is opposite to the motion leading to a decrease in the speed. 2 / 26 . 9 3 78 . 27 s m t v a = = =

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Dr. Amr Aboshousha PHCM 212-IG group 4 Example An object travels at a velocity of . After 4 second its velocity becomes . Calculate the acceleration.
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L2-Motion-2 - Lecture 2 Motion-2 Dr Amr Aboshousha PHCM...

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