Simple Harmonic Motion Department of Physics（简谐运动物理系）.pdfVIP

Simple Harmonic Motion Introduction Simple harmonic motion occurs when the net force acting on an object is proportional to the object’s displacement from an equilibrium position. When the object is at an equilibrium position, the net force acting on it is zero. The displacement of the object will be sinusoidal as a function of time and will not damp out. This is an idealized model of oscillatory motion, but it can effectively describe numerous physical scenarios while still being simple enough that physical intuition can be developed by studying the model. On the small scale, vibrating atoms in a solid can be modeled as simple harmonic oscillators where the interatomic bonds between atoms generate restoring forces on the atoms that are linear in their displacement from their equilibrium positions. On a larger scale, the swinging pendulum in a grandfather clock can also be modeled as as simple harmonic oscillator. In this case, the gravitational force generates a restoring force that is linear in the angular displacement of the pendulum for small angular displacements. In this lab, we will be using a mass on a spring system to study simple harmonic motion. You will be using two independent techniques to deduce physical properties of springs from your knowledge of Newton’s 2nd law. Spring Equipment: • LabPro Interface • Set of Springs (#3 and #4) • Motion sensor