PHY231 lecture5 - Physic 231 Lecture 5 Main points of...

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ain points of today’s lecture: Physic 231 Lecture 5 Main points of today s lecture: Newton’s 1 st law: – If there is no net force, the velocity of a mass remains constant (neither the magnitude nor the direction of the velocity changes). Newton’s 2 nd law: m is the mass of the object. It is proportional to the number a m F = of nucleons (neutrons and protons) in an object. is the net (total) force acting on the object. It is the vector sum of all forces acting on the object. F
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Newton’s First Law • If there is no net force, the velocity of a mass remains constant (neither the magnitude nor the direction of the velocity changes). bj t t t f l t f – Objects at rest feel no net force. – Objects in motion with a constant velocity feel no net force. movie
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Conceptual question A ball is thrown vertically up, its speed slowing under the influence of gravity. Suppose ( 1 ) we film this motion and play the tape backward (so the tape begins with the ball at its highest oint and ends with it reaching the point from which it was point and ends with it reaching the point from which it was released), and ( 2 ) we observe the motion of the ball from a frame of reference moving up at the initial speed of the ball. The all has a downward acceleration ball has a downward acceleration g in – a) (1) and (2). – b) only (1). – c) only (2). – d) neither (1) nor (2). reverse in run ball the of movie The ) 1 ( direction. forward in the run is it when does it as same look the would rest. from downward falling is it like look would ball the frame, moving In the (2)
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Newton’s second Law d Newton’s 2 nd law: is the acceleration. –m is the mass of the object. It is proportional to the number of a m F = a nucleons (neutrons and protons) in an object. is the net (total) force acting on the object. It is the vector sum of all forces acting on the object. F Both and are vectors with a length and a direction.
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This note was uploaded on 05/03/2011 for the course PHYS 231 taught by Professor Nagy during the Fall '11 term at Michigan State University.

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PHY231 lecture5 - Physic 231 Lecture 5 Main points of...

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