How Can I Better Understand Physics Waves for 9th Grade?

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Understanding physics waves can be challenging for 9th graders, and several online resources are available to aid comprehension. Key concepts include distinguishing between displacement and propagation, as waves represent the propagation of displacement through space. It's important to grasp that the speed of a wave allows for calculating distance traveled over time. Students are encouraged to seek clarification on specific areas of confusion to receive targeted help. Utilizing these resources and engaging with teachers can significantly enhance understanding of wave dynamics.
killjoy
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This is going to sound really dumb, but i was really hoping some of you would know some sites or have some work about waves we are studing it in my 9th grade physics class and i just can't get a grasp on it. Any thing would really be helpful

Thanks the guy who can't spell
 
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https://www.physicsforums.com/showthread.php?s=&threadid=204

thats the thread with a lot of sites. If you want some explanation in general, tell me where you fail in understanding it. What is not clear for you, and so on. I'm sure there are lots of ppl here who are able to give you a better explanation than I can.

Good luck
 
One thing that comes to mind is not to get confused with displacement and propagation. A wave is a propagation of a displacement. The displacement travels through space, and so it has a speed, and you can determine a distance traveled in a certain amount of time. The displacement of some waves (i.e. water waves and sound waves) is the same kind of distance that was just mentioned concerning the propagation, so it is easy to get them confused when you first see this stuff.
 
thanks alot

I checked those sites out and found it vary helpful and about the different kids of waves i checked with my teacher and she agreed completely

sorry its so brief but i have major homework
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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