Investigation- Pendulum

Investigation- Pendulum - I nvestigation: Analyse the...

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Investigation: Analyse the Motion of a Pendulum in relation to the mass of the Pendulum Task: What are the factors that affect the period swing of a pendulum? Introduction: A pendulum can be described in terms of its mass, length, and amplitude. The time period of a pendulum is the amount of time that a pendulum takes to swing from one peak to another which is equivalent to one oscillation. In this experiment, mass refers to the mass of the pendulum bob and it will be the independent variable. The period swing of the pendulum can be identified a transfer of gravitational potential energy to kinetic energy and then back. The most fundamental features of a pendulum are the pendulum bob, the length of the string and the initial gravitational potential energy. The motion characteristics of the period swing of a pendulum can be described a relation between gravitational potential energy and the mass of the pendulum bob. Therefore, it is predicted that the mass of the pendulum bob would affect the period swing of the pendulum. I predict that with an increase in mass the pendulum would have more momentum thus the period swing would decrease with more mass. Design: Independent Variable: The mass of the pendulum Dependent Variable: The period swing of the pendulum Controlled Variable: The length of the string attached to the pendulum bob o The length of the string will affect the time period of a pendulum because depending of the length the oscillation of the pendulum would differ, for the distance it travels would vary. The piece of string acts as a radius for the pendulum’s arc, which is similar to a circle.
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o There would be an increase or decrease in the distance travelled by the pendulum because according to C=2 r, the circumference of the circle π will increase, thus so will the length of length of the arc. Therefore, the distance travelled by the pendulum varies according to the length of the string, and therefore the time taken. o To control this variable it would be made sure that the length at which the pendulum is suspended from is measured and kept constant throughout the experiment. Since a single pendulum with one string attached to two places is used, for stability and more accuracy, the suspension of the pendulum bob is measured compared to the length of the string. The angle from which the pendulum is released o The angle from which the pendulum is released is a fundamental variable which affects the period swing: 1. Firstly, it increases the length of the arc of the circle. The greater the angle, the greater the proportion of the circle is taken by the arc. The amount (arc) that the pendulum swings through is equivalent to double the value of the angle that it’s dropped from. Of the 360 of a circle, the pendulum is released from angle Z
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This note was uploaded on 04/11/2010 for the course ENG 1p03 taught by Professor Dr.fleisig during the Spring '10 term at McMaster University.

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Investigation- Pendulum - I nvestigation: Analyse the...

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