Warm-Up Grade the HW Grade the HW 64 PTS 64 PTS Put it in the in-box Put it in the in-box

Wave Characteristics

Mechanical Waves Moving disturbance of matter that transfers energy but not matter. Moving disturbance of matter that transfers energy but not matter. There is no net movement of matter There is no net movement of matter Buoy in water Buoy in water

Mechanical Waves Medium Medium The material through which a wave is traveling The material through which a wave is traveling Pulse Pulse A single wave A single wave Periodic Periodic Repeating patterns of pulses Repeating patterns of pulses

Parts of a Wave

Mechanical Waves Longitudinal Wave Longitudinal Wave Wave direction and medium direction are parallel Wave direction and medium direction are parallel Sound, EM Waves, Compression Waves, p and s waves Sound, EM Waves, Compression Waves, p and s waves Transverse waves Transverse waves Medium moves at right (up and down) angles to the direction of wave movement Medium moves at right (up and down) angles to the direction of wave movement Water Water

Longitudinal Waves

Measurements of a Wave Wavelength (λ) – distance between two consecutive points on a wave measured in meters Wavelength (λ) – distance between two consecutive points on a wave measured in meters Frequency (f) – number of cycles of waves per second measured in 1/s or Hz Frequency (f) – number of cycles of waves per second measured in 1/s or Hz Period (T) – time per one cycle Period (T) – time per one cycle T = 1/f T = 1/f

Wave Function λ = v/f λ = v/f

Reflection Fixed end reflection Fixed end reflection Free end reflection Free end reflection

Law of Reflection Incident angle equals reflected angle Incident angle equals reflected angle θ i = θ r θ i = θ r

Interference Constructive – two waves have amplitudes on the same side of equilibrium and amplify one another Constructive – two waves have amplitudes on the same side of equilibrium and amplify one another Destructive interference – amplitudes are on opposite sides of equilibrium Destructive interference – amplitudes are on opposite sides of equilibrium Superposition Principle – use of algebraic sums to determine the amount of the amplified pulse Superposition Principle – use of algebraic sums to determine the amount of the amplified pulse

Destructive vs. Constructive Sound Demo from PHET Sound Demo from PHET

Standing Waves When periodic interference occurs, standing waves are generated. When periodic interference occurs, standing waves are generated. Nodes Nodes Antinodes Antinodes

Topics on the test 5MC 5MC Kinematics – Lesson 17 Kinematics – Lesson 17 Equilibrium of hanging mass Equilibrium of hanging mass Movement and kinetic friction Movement and kinetic friction Instantaneous and Average on a graph (ps 12 #1-4, 5) Instantaneous and Average on a graph (ps 12 #1-4, 5) Forces Forces Impulse and change in momentum – Lesson 19 (#1, 3, 7, 15, 16) Impulse and change in momentum – Lesson 19 (#1, 3, 7, 15, 16) Kinetic energy Kinetic energy Work, power, potential energy (ps 11 #1 Work, power, potential energy (ps 11 #1