College Physics Chapter 9 vibration

Simple harmonic vibration

Speed 、 Acceleration expression

Example

Just look at this question , I don't think I can pass the exam

The same goes for this question , The examination should not involve proving simple harmonic vibrations

Simple harmonic vibration physical quantity

The amplitude

cycle

frequency

Angular frequency （ angular velocity ）

Phase and initial phase

Example

Take a good look at this question , It is a relatively complete survey of knowledge points

Rotation vector

Example

This article 2 The rotation vector method is very simple , It doesn't have to be so complicated

The first 1 ask , It can be solved by rotating vector method

Energy of simple harmonic vibration

Example

The synthesis of simple harmonic vibration

In the same direction 、 Same frequency

explain

In the same direction 、 Synthesis of different frequencies

The combined vibration is not a simple harmonic vibration , But it can be roughly seen as simple harmonic vibration

Mainly remember the formula of combined vibration

pat 、 Beat frequency