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روان شناسی و مشاوره::
نوسان آونگ
They were asked to figure out what factor determines the oscillation of the pendulum: the weight, the length of string, the height of dropping point, or the force of push?
For example, the adolescents may have started out with the hypoth- esis that the length of the string determines the oscillation of the pendulum.
At the same time, they realise that there are other factors (e.g. weight) that might also affect the oscillation of the pendulum.
Thus, in order to arrive at a definite answer that it is only the length of the string that affects the oscillation of the pendulum, they have to vary the length of the string and hold the other factors constant (e.g. compare the frequency of oscillations for long and short strings, holding the weight, force of push, and height of
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