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# Waves, work power

### Waves, work and power

Wave Vibration of a medium
Medium material through which a wave can travel
Crest the highest point in a wave
Trough Lowest point in a wave
Transverse wave When particles move perpendicularly to the direction the wave travels
Longitudinal wave Particles move back and forth
Compression When particles are pushed together
Rarefaction When particles are spread apart or separated from each other
Mechanical waves Waves that require a medium
Electromagnetic waves waves that can travel without a medium
Amplitude how far particles move from the rest position
Wavelength distance from any point on the wave to the next identical point
Frequency Time it takes for certain points in a wave to pass a specific points
Hertz One hertz equals one wavelength per second
Wave speed speed waves travel
Force the push or pull that moves and object
Work when an object has been pushed or pulled the same way as the force, work has been done on the object work = force x distance
Power How much time it takes to move an object work divided by time equals power
If Dirk was climbing the stairs and it took him 30n of force to get up them and the stairs were 25 meters how much power did he use? w = force x distance w = 30n x 25m W = 750 j
If Dave was running down the halls and the halls were 10 m and he used 60 j to get down them and it took him 50 seconds how much power did he use? w = f x d w = 60 n x 10 m w = 600 j Power = work divided by time P=600 divided 50 P= 14 w
In a transverse wave the highest point in the wave is called the crest and the lowest point in the wave is called the trough what is like this in a longitudinal wave? Compression and rare faction
What is measured in joules? Work is measured in joules work = joules
What is measured in Watts? Power is measured in watts power = watts
What is measured in newtons ? Force is measured in newtons force = newtons
What do Hertz measure? Hertz measure length in a wave per second
If Mattchu is walking down the halls of the school ( cause as everyone knows you shouldn't run down the hallways) and he walks for 4 meters to his classroom and it takes him 60 seconds and he uses 30 j to get there how much power did he use? Power equals work divided by time P = 60 divided by 30 P = 2 w
Created by: 306930