Wiggles, vibrations, and oscillations are an inseparable part of nature.
An understanding of vibrations and waves is essential to understanding our physical world.
Much of what we see and hear is only possible because of vibrations and waves.
We see the world around us because of light waves. And we hear the world around us because of sound waves. If we can understand waves, then we will be able to understand the world of sight and sound.
- Think about how you would describe the back and forth motion of the oversized head of a bobblehead doll.
- What words would you use to describe such a motion? How does the motion of the bobblehead change over time?
- How does the motion of one bobblehead differ from the motion of another bobblehead?
- What quantities could you measure to describe the motion and so distinguish one motion from another motion?
- How would you explain the cause of such a motion?
- Why does the back and forth motion of the bobblehead finally stop?
- The resting position is the position assumed by the bobblehead when it is not vibrating. The resting position is sometimes referred to as the equilibrium position.
- When an object is positioned at its equilibrium position, it is in a state of equilibrium. Newton's Law - an object which is in a state of equilibrium is experiencing a balance of forces.
- All the individual forces - gravity, spring, etc. - are balanced or add up to an overall net force of 0 Newtons.
- When a bobblehead is at the equilibrium position, the forces on the bobblehead are balanced.
- The bobblehead will remain in this position until somehow disturbed from its equilibrium.