Ch. 15.1 Waves Transfer Energy
Vocabulary Wave – A disturbance that transfers energy Medium – any substance a wave moves through Mechanical wave – a wave that transfers energy through matter Transverse wave – a wave that travels at right angles to the direction of the disturbance Longitudinal wave – a wave that travels in the same direction as the disturbance
Energy can be kinetic or potential Kinetic – the energy of motion. A moving object has the most kinetic energy at the point where it moves the fastest. Potential – Stored energy; the energy an object has due to its position, molecular arrangement, or chemical composition.
Wave Characteristics Transfers energy over entire distance Matter moves in place Examples Sound waves Light waves Water waves Nonexample Ball rolling Water rushing downstream
15.1 Transverse Wave direction of disturbance direction of wave Waves transfer energy. Transverse Wave direction of disturbance direction of wave transfer of energy wave medium mechanical wave transverse wave longitudinal wave CHAPTER RESOURCES SIMULATION Simulate the effect different degrees of force have on a wave. SECTION OUTLINE
Medium Characteristics Examples Nonexample All materials Water – ocean wave Ground – earthquake wave Rope – rope wave Nonexample A wave itself
Energy and Waves Forces move a medium up and down or back and forth. A wave moves forward.
Waves can be classified by how they move Transverse wave – the direction in which the wave travels is perpendicular, or at right angles, to the direction of the disturbance Ex) rope wave, water wave Transverse = “across” or “crosswise”
Waves can be classified by how they move Longitudinal – the wave travels in the same direction as the disturbance Started in a spring by moving it forward & backward Sometimes called compression waves, because bunched up area is known as a compression Ex) sound waves, waves on a spring
15.1 Longitudinal Wave direction of disturbance direction of wave Waves transfer energy. wave Longitudinal Wave direction of disturbance direction of wave transfer of energy medium mechanical wave transverse wave longitudinal wave CHAPTER RESOURCES SECTION OUTLINE