# Lesson Plan: Free and Forced Oscillations Physics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to describe the effect of a forcing frequency on an oscillation amplitude and how amplitude decreases due to dissipation.

#### Objectives

Students will be able to

• define a free oscillation as the oscillation of an oscillator resulting from releasing the oscillator from a position where its displacement from its equilibrium position is nonzero,
• define the natural frequency of an oscillator as the frequency of its free oscillation,
• define a forced oscillation as the oscillation of an oscillator resulting from the continuous action of an applied force acting at a frequency independent of the natural frequency of the oscillator, known as the driving frequency,
• recognize that the greatest amplitude of forced oscillation occurs for forced oscillations that have a driving frequency equal to the natural frequency of the oscillator,
• recall that the term resonance is used to refer to the forced oscillation of an oscillator with the greatest amplitude,
• recall qualitatively the shape of the graph of amplitude of oscillation against the driving frequency for a forced oscillator,
• recall qualitatively the shape of the graph of amplitude of oscillation against time for a free oscillator that is overdamped, underdamped, or critically damped.

#### Prerequisites

Students should already be familiar with

• simple harmonic motions.

#### Exclusions

Students will not cover

• equations of resonance of oscillation,
• equations of damped simple harmonic motion.