Possible influence of an independent variable on the dependent variable is to The typical way to carry out an experiment to investigate the Measurements, you would have to take the effect into account. Location, in fact, influences the period, although the effect is so small that An example might be your location on the surface of the Earth. However, even if you're competent, you can still overlook That's part of being aĬompetent scientist. The motion of the elevator influenced the results. Of course, it's not likely that you wouldĭo this experiment in an elevator and, if you did, you would probably guess that That's because theĮlevator accelerates and decelerates and, as it turns out, such motion Would discover some strange results and find it difficult to reach conclusionsĪbout how the independent variables affected the period. The experiment in an elevator that was moving up and down between floors. For the case of the pendulum, for example, suppose you carried out World that there are variables that the experimenter has overlooked and has notĬontrolled. By the way, the reason we said fairly confident is because there's always the possibility in dealing with the natural Such an experiment isĬalled a controlled experiment. Variable that influenced (or didn't influence) the period. In this way, if an influence (or lack thereof) is found on the period, one canīe fairly confident that the independent variable that was changed is the Independent variables is changed at a time while the others are held constant. Influence the period, one needs an experimental design in which only one of the In order to determine how each of the independent variables may The period is termed the dependent variable, because its value may depend on the values of the independent Variables are termed independent variables, because one selects their Some variables whose influence oneĬould investigate include the length of the string, the mass of the bob, and theĪngle from the vertical at which the string is released. Variables influence the period of the pendulum, that is, the time for the bob toĮxecute one complete cycle over and back. Suppose the goal of the investigation is to determine which For example, consider a simple pendulum which is composed ofĪ compact weight (bob) that is hung from a string attached at its upper end to aįixed support. You'll also learn how to determine functional relationships between variables.Ĭommon type of laboratory investigation is to determine the relationship between In this lab, you'll actually learn about the pendulum itself and what what things influence its period. In that lab, a pendulum was used to help you learn how to reduce uncertainty in timing. You were introduced to the simple pendulum in L101. Use the relationship to design a pendulum that has a period of 1.000 s.Determine how the period of a simple pendulum is influenced by a) the mass of the bob, b) the angle of release, and c) the length of the pendulum.You'll use this knowledge over and over again in your study of physics. In the process, you'll learn about the simple pendulum. This is a hands-on lab that will extend your use of graphical analysis techniques as well as teach you some fundamentals of laboratory work.
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