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X-axis, as disregard air resistance, the speed does not vary, and along the horizontal trajectory, we have a Uniform Rectilinear Motion (MRU). For the y axis, the villain is the weight force, it causes the speed varies, decreasing the rise and increasing the descent. How? The value of the acceleration of gravity is around 9.81 m / s2 (varies with altitude), this means that every 1s, the speed increases or decreases 9.81 m / s, depending, of course, the meaning of speed. In general, we consider that the acceleration is constant, so we call this movement of Rectilinear Movement Evenly Miscellaneous (MRUV). But how to get the speed on each axis? In Figure (4), we have the launch speed of the hammer on a graph. Note that this speed, represented by the red arrow, has inclination in relation to both the x axis and in relation to the y axis. The velocity components are obtained by its projection onto these axes. It is as if we sought the shade of the red arrow to the axes. These "shadows" are represented by blue arrows in Figure (4). Figure 4: Projection of the velocity in the x and y axes. The projection over the x-axis is called Vx, and that remains constant is in our study. With respect to the y axis, the projection will be calledy V and velocity component is associated with the time. But what is the value of each component? To learn the value of each component must resort to a group of mathematical functions Trigonometric calls. Two of them in particular interest: the sine function and cosine function. There are records of these functions in studies conducted by Hipparchus(194-120 BC), a student who used the technique to measure arcs through strings.
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X-osi, kao zanemarite otpor zraka, brzina ne mijenja, a na vodoravnoj putanji, imamo Jedinstveni pravocrtno Motion (MRU). Na osi y, negativac je težina sila, što uzrokuje brzina varira, smanjuje rast i povećanje spust.Kako? Vrijednost ubrzanja sile teže je oko 9,81 m / s2 (mijenja se s nadmorskom visinom), to znači da svaki 1s, brzina se povećava ili smanjuje 9,81 m / s, ovisno, naravno, značenje brzina. Općenito, smatramo da je akceleracija je konstanta, pa smo to nazivamo kretanje pravocrtno pokreta Ravnomjerno Razno (MRUV). No, kako doći brzine na svakoj osovini? Na slici (4), imamo pokretanje brzinu čekića na graf. Imajte na umu da je ova brzina, zastupan po crvenom strelicom, ima nagib u odnosu na obje osi x, a u odnosu na osi y. Brzina dijelovi su dobiveni svojoj projekciji na ove osi. To je kao da smo tražili nijansu crvene strelice na osi. Ovi "Sjene" predstavljeni su plavim strelicama na slici (4). Slika 4: Projekcija brzine u xiy osi. Projekcija preko x-osi se naziva Vx, te da ostaje konstanta u našoj studiji. S obzirom na osi y, projekcije će biti pozvaniy V i brzine komponenta povezana s vremenom. No, ono što je vrijednost svakog elementa? Da biste saznali vrijednost svake komponente mora posegnuti za skupinu matematičkih funkcija Trigonometrijski poziva. Dvije od njih posebno interesa: sinus kosinus funkcija i funkcija. Postoje zapisi o tim funkcijama u istraživanjima Hiparhu(194-120 BC), student koji je koristio tehniku za mjerenje lukove kroz žice.