A child of mass 20 kg swings on a swing of length 3.0 m. Mom pulls the child to an initial angle θ0 = 10◦. This is a sufficiently small angle that the swing undergoes SHM(simple harmonic motion). i. What is the period T of one swing? What is the angular frequency ω? Does it depend on the mass of the child? ii. What would the period be if the swing were on the Moon? iii. What is the effective force constant k of the system?
Simple harmonic motion
Simple harmonic motion is a type of periodic motion in which an object undergoes oscillatory motion. The restoring force exerted by the object exhibiting SHM is proportional to the displacement from the equilibrium position. The force is directed towards the mean position. We see many examples of SHM around us, common ones are the motion of a pendulum, spring and vibration of strings in musical instruments, and so on.
Simple Pendulum
A simple pendulum comprises a heavy mass (called bob) attached to one end of the weightless and flexible string.
Oscillation
In Physics, oscillation means a repetitive motion that happens in a variation with respect to time. There is usually a central value, where the object would be at rest. Additionally, there are two or more positions between which the repetitive motion takes place. In mathematics, oscillations can also be described as vibrations. The most common examples of oscillation that is seen in daily lives include the alternating current (AC) or the motion of a moving pendulum.
A child of mass 20 kg swings on a swing of length 3.0 m. Mom pulls the child to an initial angle θ0 = 10◦. This is a sufficiently small angle that the swing undergoes SHM(
i. What is the period T of one swing? What is the angular frequency ω? Does it depend on the mass of the child?
ii. What would the period be if the swing were on the Moon?
iii. What is the effective force constant k of the system?
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