How to choose the angle for inclined plane problems скачать в хорошем качестве

How to choose the angle for inclined plane problems

In physics, sometimes the best way to make a problem simpler is to change the coordinate plane. Learn why the angle Proving the angle for inclined planes Confused on where to put the angle on inclined plane problems? Don't feel like memorizing it? Let's prove this using three basic principles from geometry: A straight line is 180º A triangle has a total of 180º A right angle is 90º From the last video we learned that rotating the coordinate axis could save us time and effort. But when doing it, we need to brake up the force of gravity into parts parallel and perpendicular to the surface. Notice how I draw the perpendicular part of gravity following right below the normal force. Anything perpendicular to the surface is a right angle, or 90º. Did you notice how long arrow is for the force of gravity? I've made it longer this time so you can see how it forms a right angle with the with the base of the slope. Now, all the angles in a triangle must add to 180º. This means that the angle on the top of the slop must be 60º. Let's make an arc that reminds us that a line is 180º. So if one point of the line to the other is 180º, and we know that 90º and 60º are taken care of, we are only missing what's left. So we take 180º-90º-60º and get 30º. And that is why we use can use the angle of the slope in our similar triangle.   / michaelkocher   http://myweb.ecu.edu/student/kochermi18/