Pass in labs. Place in class box. Make sure they are stapled and have your name on it.

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Presentation transcript:

Pass in labs. Place in class box. Make sure they are stapled and have your name on it

Trhodes Physics

What are 5 facts about the Slinky?

* Invented in 1945 * By Richard and Betty James * Richard was a naval engineer researching tension springs * Slinky is a Swedish word – stealthy, sleek, sinuous * Debuted at Gimbel’s in Phila. * 400 slinkys sold in 90 minutes * Still made in Hollidaysburg, PA

Ace Ventura

I. Transverse Wave

How does the direction of the motion of the slinky coils compare to the motion of the pulse?

Transverse Wave The coils motion is PERPENDICULAR to the motion of the pulse. Only energy travels onwards. No matter is moved permanently.

The Anatomy of a Wave

Transverse Wave

II. AMPLITUDE

Does the amplitude of the pulse change as the pulse moves from one end of the slinky to the other? Why?

Amplitudes Energy related to Amplitude A high energy wave = high amplitude A low energy wave = low amplitude

Energy ONLY affects the amplitude. Energy does NOT affect wavelength, frequency or speed of the pulse. Ideal Situation: Amplitude determined ONLY by source/energy Un-Ideal: Amplitude may get smaller throughout due to friction (loses energy) Un-Ideal: Amplitude can be affected by elasticity of medium

III. REFLECTION

Draw sketch of the pulse before and after it is reflected on the fixed end.

Incident pulse = introduced by source Reflected pulse = returns to source

Fixed End Situation: Reflected Pulse is INVERTED

Draw sketch of the pulse before and after it is reflected on the free end.

Free End Situation: Reflected Pulse is Upright (On Same Side) Not Inverted

Reflected Pulse: ** Speed is the same as incident pulse ** Wavelength the same as incident pulse ** Frequency the same as incident pulse ** Amplitude less than incident pulse (Loses energy)

IV. Speed

Does Amplitude have an Affect on Speed? Amplitude has no effect on speed

Does Frequency and Period have an effect of Speed? Frequency and Period have no effect on speed

What affects speed of a Wave? Speed ONLY affected by the Medium Tension (Elasticity, Density) of medium affects speed. Greater tension = Greater Speed

V.LONGITUDINAL WAVE

Longitudinal Wave Coils motion is PARALLEL to the motion of the pulse. Particles compress and rarefact. Only energy travels onwards. No matter is moved permanently.

Compression - particles have maximum density - close together Rarefaction - Particles have minimum density - Far apart

Longitudinal

VI. INTERFERENCE

Wave interference is the phenomenon which occurs when two waves meet while traveling along the same medium. They pass through one another unaffected!!!

Constructive Interference- Amplitudes ADD

Destructive interference amplitudes subtract

When two waves interfere, the resulting displacement of the medium at any location is the algebraic sum of the displacements of the individual waves at that same location. Principle of Superposition

Displacement of Pulse 1 Displacement of Pulse 2 =Resulting Displacement +1 =+2 =-2 +1=0 +1-2=

Destructive InterferenceConstructive Interference A.B. add Subtract Pass through unaffected

Homework - Interference Worksheet