Osscilation

Oscillation

Junior College 2

​Topics

1. Simple Harmonic Oscillation

2. Energy in simple harmonic motion

3. Damped and forced oscillation

4. Resonance​

​Learning Objectives

​1. Understand oscillation's quantities (displacement, amplitude, period, frequency, angular frequency and phase difference) in the context of oscillations, and express the period in terms of both frequency and angular frequency.

​​2. Understand that simple harmonic motion occurs when acceleration is proportional to displacement from a fixed point and in the opposite direction.

​​3. Interpret displacement, velocity and acceleration graphs

​4. Recall and use the equation of kinetic energy

​5. Sketch displacement-time graphs for damped force

​6. Resonance involves maximum amplitude of oscillation

Multiple Choice

What is Oscillation?

• Circulate motion from beginning point to end point

• Going back and forth repeatedly between two positions or states.

• Unbalanced motion creates cycles

• All correct

​Simple Harmonic Motion​

Simple Harmonic Motion or SHM is defined as a motion in which the restoring force is directly proportional to the displacement of the body from its mean position. The direction of this restoring force is always towards the mean position.

​https://www.youtube.com/watch?v=XjkUcJkGd3Y

Free and Forced Oscillation​

Multiple Choice

In a simple pendulum, which force brings the mass back to equilibrium?

• Gravitational force

• Tension

• Elastic force

• Friction

Multiple Choice

Which graph can be used to describe oscillation?

• displacement-time graph

• amplitude-time graph

• displacement-length graph

• time invariant graph

Multiple Choice

What is meant by forced oscillation?

• When an object is vibrating at its natural frequency

• When an object continues to vibrate after the disturbance is removed

• When an object vibrates at a frequency which is different from its natural frequency

• When an object receives a vibration from external sources

​Damped Oscillation

​Resonance occurs when the frequency of the driving force is equal to the natural frequency of the oscillating system. The system absorbs the maximum energy from the driver and has maximum amplitude.