M2_Momentum & Energy

M2_Momentum & Energy - NANYANG TECHNOLOGICAL...

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Unformatted text preview: NANYANG TECHNOLOGICAL UNIVERSITY G 171: Laboratory Experiment 1A Formal report For Experiment M2 Energy and Momentum Principles By Gan Rui Wei Group BL 08 (020387J03) Submit to: Foo J.J 1 TABLE OF CONTENT PART 1: CONSERVATION OF ENERGY IN A GRAVITATIONAL FIELD 1.1 INTRODUCTION 1.2 OBJECTIVE 1.3 APPARATUS 1.4 EXPERIMENTAL PROCEDURE 1.5 EVALUATION AND RESULTS 1.6 DISCUSSION 1.7 CONCLUSION PART 2: CONSERVATION OF LINEAR MOMENTUM 2.1 INTRODUCTION 2.2 OBJECTIVE 2.3 APPARATUS 2.4 EXPERIMENT PROCEDURE 2.5 CALCULATION 2.6 DISCUSSION 2.7 CONCLUSION 2 PART 1: CONSERVATION OF ENERGY IN A GRAVITATIONAL FIELD 1.1 INTRODUCTION This experiment is the demonstration of conservation of mechanical energy in the swing of a pendulum in the presence of gravity. A compound pendulum is released from a certain angle from its equilibrium and then allowed to oscillate about a knife-edged pivot in a gravitational field. During the oscillations, potential energy is converted to kinetic energy and vice versa. The potential energy is maximum at the highest point of the pendulum swing while the kinetic energy is the maximum at the equilibrium point. It will be experimentally demonstrated that the maximum potential energy at the highest of the pendulum swing is equal to the maximum kinetic energy at the lowest of the swing. Maximum potential energy = maximum kinetic energy (1) I.e. all the potential energy is converted to kinetic energy. 1.2 OBJECTIVE This experiment helped us to have a better understanding of: a. Potential energy in a gravitational field; b. Rotational kinetic energy of a solid body; c. Conservation of energy in a gravitational field; d. Moment of inertia about an axis. 3 1.3 APPARATUS a. 1 pendulum, consisting of a long bar with a round disc at one end, and b. Attached to a knife-edged pivot block at the other end c. Support stands d. 1 digital photo timer e. 1 protractor f. 1 stopwatch Apparatus set-up Fig 1.1 Pendulum set-up Note: *Make sure that the pivot block lies along the marked line on the support; *Adjust the height of the sensor so that it is pointing more or less at the Center of the pendulum disc. 4 *Note the reading on the protractor for the pendulum in its equilibrium position 1.4 EXPERIMENTAL PROCEDURE Part (a): The digital photo timer was first switched on, followed by the displacement of the pendulum from rest at an angle of 20 .The reading on the timer was recorded as the pendulum first passed its equilibrium (lowest) point, while making sure that the pendulum was swinging in a vertical plane. The experiment was repeated for angles of displacement of 30, 40, 50 and 60 with all the readings recorded in Table 1.1 in the log sheet. Part (b): The photo timer is switched off with the pendulum released at a small angle (less than 5) from its equilibrium position. Care was taken to make sure that the pendulum is swinging in the vertical plane. The time of 10 oscillations was then measured and recorded in the log sheet. However, since the time of 10 oscillations is known, the recorded in the log sheet....
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M2_Momentum & Energy - NANYANG TECHNOLOGICAL...

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