Zhikai SecondLaw - |PC1221 Lab Report: Newtons Second Law|...

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||PC1221 Lab Report: Newton’s Second Law|| ||Wang Zhikai|| ||A0080959N|| ||Group A1|| ||PC1221 Lab Report: Newton’s Second Law|| ||Wang Zhikai|| ||A0080959N|| ||Group A1|| 1 Objectives To investigate the variation in the acceleration produced when the net force applied to the object stays constant but the mass of the system is changed. To investigate the variation in the acceleration produced when the net force applied to the object is changed but the mass of the system stays constant. 2 Introduction When the motion of any object changes due to a net force, it’s behaviour can be described by Newton’s second law, which is F = ma , where F is the net force acting on the object of mass m , and a is the resulting acceleration of the object. When an object is in free fall, its acceleration has been determined experimentally to be 9.8m/s. When the net force acting on the object is nonzero, the velocity of the object changes over time; it accelerates. Force and acceleration have a directly proportional relationship; the larger the force, the greater the acceleration. According to Newton’s Second Law, not only are F and a directly proportional to each other, they also have the same vector direction. It is also shown from the equation F = ma that acceleration has an inversely proportional relationship to the mass. When the net force is kept as a constant and the mass increases, the acceleration decreases, and vice versa. 3 Methodology Part A: Constant Force We measured and recorded the mass of the cart as m 1 . We then adjusted the track to ensure it was parallel to the table by using the cart to check if it rolls when it is placed on the track. We attached the pulley at one end of the track. A string was tied to the lower attachment point of the cart. We adjusted the pulley so that the string runs parallel to the track. A mass hanger was hooked from the other end of the string. We adjusted the string so that when the cart is at the pulley, the mass hanger at the end of the string does not touch the floor. Next, we pulled the cart back until the mass hanger reaches the pulley. We recorded this initial release position as x 1 and fixed this release position for all trials. We then set another point on the track as the final position of the cart, x 2 , while ensuring the final position was far enough from the magnetic force such that our experiment was not affected by this force. We then conducted a test run to determine how much mass we needed on the mass hanger so that the cart took approximately 2 s to complete the run. We then measured and recorded this mass. Next, we pulled the cart back to its initial position. We released the cart and timed how long it took to reach the final position with a stopwatch and recorded down the timing as t 1 . We repeated this 4 more times with the same mass. Next, we added mass to the top of the cart and recorded the total mass of the cart plus the extra mass and
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This note was uploaded on 01/09/2012 for the course ELECTRICAL 1221 taught by Professor Tan during the Spring '11 term at National University of Singapore.

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Zhikai SecondLaw - |PC1221 Lab Report: Newtons Second Law|...

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