Pendulum Experiment
Pendulum Experiment - Related Videos
01:10
Simple Pendulum
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2023
A simple pendulum consists of a small diameter ball suspended from a string, which has negligible mass but is strong enough to not stretch. In our daily life, pendulums have many uses, such as in clocks, on a swing set, and on a sinker on a fishing line. The period of a simple pendulum depends on two factors: its length and the acceleration due to gravity. The period is completely independent of any other factors, such as mass or maximum displacement. For small displacements, a pendulum is...
01:09
Torsional Pendulum
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2025
A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected. As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
01:06
Physical Pendulum
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2023
When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°. When dealing with complicated systems, the mass moment of inertia is an important parameter, as it describes the mass...
06:58
The Factorial Experiment
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2023
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University A factorial design is a common type of experiment where there are two or more independent variables. This video demonstrates a 2 x 2 factorial design used to explore how self-awareness and self-esteem may influence the ability to decipher nonverbal signals. This video leads students through the basics of a factorial design including, the nature of a factorial design and what distinguishes it from...
01:12
What is an Experiment?
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2023
An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
FAQs
Under small-angle conditions, gravity acts as the restoring influence, pulling the bob toward equilibrium after release. The resulting oscillation has a period that depends mainly on pendulum length, while changing the bob’s mass should not be the primary determinant. This relationship lets investigators isolate length as a causal variable when examining the timing of the motion.
Small-angle conditions make the relationship between length and period easier to interpret because the motion follows the stated dependence primarily on length. Keeping the initial displacement comparable across trials helps preserve that condition and reduces an alternative explanation for timing differences. In a psychology study, consistent physical conditions also make participants’ reasoning or timing responses easier to compare.
Participants may need to decide which feature of the setup could explain differences in motion, form a hypothesis, and attend to the resulting pattern. Because the physical system has a known relationship between length, mass, and period, their predictions can be considered alongside what actually occurs. The task therefore links observable choices or judgments with scientific reasoning processes.
An investigation can track the pendulum’s length, the bob’s mass, the initial displacement, and the period after release. These variables connect directly to the system: gravity drives the return toward equilibrium, while small-angle timing is expected to depend chiefly on length. Recording them supports clearer comparisons between physical results and a participant’s prediction or perception of timing.
Psychology researchers can use the visible oscillation as a common event while examining how people perceive its timing or coordinate movement with it. The task provides an observable physical pattern and a human response, allowing perception and motor coordination to be considered together. It can also show whether differences in performance reflect timing judgments, movement control, or both.
It places reasoning in a concrete system governed by gravity, equilibrium, length, mass, and periodic motion. A participant’s hypothesis or prediction can be related to an event that unfolds visibly rather than to an entirely verbal problem. This makes the experiment useful for connecting scientific reasoning with perception and coordinated action while retaining a clear physical cause-and-effect structure.