Glog text
Water Waves
Transfer of energy
Example of water waves: Tsunami
Tsunami Facts
Reflection of waves
Waves nearing shore
What is a damped wave?
Introduction
Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. The radius of the circles decreases as the depth into the water increases. They are Transverse on the surface, this is because the motion of the surface water waves go up and down,which is perpendicular from the still surface of the water.
Longitudinal because the underwater goes back and forth which is parallel to the water, making it Longitudinal.
Water waves in ripple tanks
When water waves near the shore (shallow water)
the wave length decreases (wavefront come closer to each other)
and amplitude increases (waves become higher)
Also the wave refracts towards the normal (water waves reach shore nearly at 90 degrees)
Tsunami
Wavelength: 100-500km
Period: 10-120 minutes
Speed: 800-965 km/h
Normal wind-generated waves
Wavelength: 100-200m
Period: 5-20 seconds
Speed: 8-100 km/h
Thus, tsunamis are extremely large waves with tremendous amount of destructive energy.
Notice that the life bouy only moves up and down and does not move left and right. So waves only transfer energy not matter
When water wave hits a surface, like light waves, it reflects.
It will reflect back at the same angle it incident on the surface. That is Angle of reflection is the same as the Angle of incidence.
The incident wave, reflected wave and the normal all lie in the same plane.
Normal is the line perpendicular to the surface.
In physics, a ripple tank is a shallow glass tank of water to demonstrate the basic properties of waves. It is usually illuminated from above, so that the light shines through the water. Some small ripple tanks fit onto the top of an overhead projector, i.e. they are illuminated from below. The ripples on the water show up as shadows on the screen underneath the tank.
A damped wave is a wave whose amplitude of oscillation decreases with time, eventually going to zero. This is due to air resistance or water resistance and other factors such as types of mediums.
They are wind generated off the surface of water bodies. They can travel very long distances. They range from being small of only a few centimeters to huge ones of up to 30m.
They can be ripples travelling along the surfaces of the water. Their wavelengths are usually less than a few centimeters.
Description: this project includes information about the properties of water waves, how wavefronts come closer to each other when the waves are nearing the shore, what are the factors of the ocean cause matter to move across the water surface since waves do not transfer matter, what triggers tsunami in explanation of tsunami using the graph
Done by:
Mohideen Imran Khan (24)
LV Sree Subbash (15)
Tai Jing An (31)
Tan Yong Jie (33)
Class: 3/1
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