Newton’s third law means that the objectĮxerts an equal and oppositely directed force on the wall. This change in momentum means that a force from the With momentum collides with something such as a wall, this object experiencesĪ change in momentum. ![]() What we have seen from this situation is the following. Where □ is the force and □ is the area over Then, we can calculate the pressure on the wall. We now have a force acting all over the wall’s surface, as a result ofĪll of the collisions. Means that it has some momentum, which we will call □ ,ĭirected toward the wall. ![]() The ball has some mass and has a velocity directed toward the wall. We will imagine that the ball travels directly To understand how this works, we will consider an example of an object, such asĪ ball, colliding with a wall. The important thing is simply that they do have momentum, because it is thisįact that means they must exert a pressure on surfaces that they are incident Electromagnetic waves do have a momentum, but it is calculatedįor our purposes, it does not matter precisely how this momentum is defined. Well, the formula □ = □ □ only applies for objects that However,Įlectromagnetic waves do not have any mass. This definition works well when we are considering physical objects. We can recall that the usual definition of momentum is This phenomenon was first predicted by the physicist It turns out that electromagnetic waves transfer momentum We can recall that light, or electromagnetic radiation in general, may be Incidence and also on the direction of polarization.In this explainer, we will learn how to calculate the pressure exerted on an The intensity of the reflected light depends on the angle of.The product $n\sin\theta$ is the same for the incident and.The angle of reflection is equal to the angle of.We haveĪlready discussed the laws of reflection and refraction in Chapters Of light-or electromagnetic waves in general-at surfaces. The subject of this chapter is the reflection and refraction Mike The Feynman Lectures on Physics New Millennium Edition Your time and consideration are greatly appreciated. So, if you can, after enabling javascript, clearing the cache and disabling extensions, please open your browser's javascript console, load the page above, and if this generates any messages (particularly errors or warnings) on the console, then please make a copy (text or screenshot) of those messages and send them with the above-listed information to the email address given below.īy sending us information you will be helping not only yourself, but others who may be having similar problems accessing the online edition of The Feynman Lectures on Physics. This type of problem is rare, and there's a good chance it can be fixed if we have some clues about the cause. which operating system you are using (including version #).which browser you are using (including version #).If it does not open, or only shows you this message again, then please let us know: So, please try the following: make sure javascript is enabled, clear your browser cache (at least of files from ), turn off your browser extensions, and open this page: If you use an ad blocker it may be preventing our pages from downloading necessary resources. ![]() If you have have visited this website previously it's possible you may have a mixture of incompatible files (.js. In order to read the online edition of The Feynman Lectures on Physics, javascript must be supported by your browser and enabled. There are several reasons you might be seeing this page.
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