This lecture will give you a full description of how you can draw perfect sketches in physics. First of all, we have to follow some general rules. A perfect sketch, let's have the following characteristics. It must be complete, we must use the correct labels of all quantities involved. It must be of proper size. Remember, but your teacher doesn't want to give his eyes tired.
All involved factors must be described. Now, I will show you some samples in different fields of physics. Let's start with an example of mechanics. A small object of negligible dimensions, is released from the top of an inclined plane of angle theta. The coefficient of kinetic friction is me. Determine the acceleration of the object.
Express your answer as a function of theta. Me in G, acceleration of gravity. Let's talk during this case we have to start off with the forces. Gravitational normal force and kinetic friction. Second step is the correct choice of axes. axes x must always be one of the motion.
And why must be perpendicular to x? direction of motion must be taken as positive. Remember it. The only force which must be broken down into components is the gravitational one. Okay. Now, let's go to example two which has to do with electromagnetism.
Determine the magnitude and direction of the electric field of the center of square which sides to 10 centimeters long, if the corners taken an irritation, half charges for one micro globes and negative two micro kudos cheers The way of joining the skirts is based on the theory about the field produced by each one of the charges. In simpler words, the negative charges produce vectors of field having directions towards recharges, and just the opposite is correct for the positive. So we start drawing for separate words separately, one for each sounds, and then find the resultant vectors. Using these have the same direction first, and then using the rule of parallelogram, get it. Example three is taken from the feet of waves and optics. a beam of light is emitted from a point source at the bottom of a pole.
If the refraction index of water has a value n, and the depth of water is H, determine the radius of the circle of light, what will be produced all the surface of the water for an observer standing out of the boat In this example, we need to draw rays of light coming from the shoulder and experiencing refraction and total internal friction, if the incident angle is greater than the critical, I have not solved the above examples. The main goal of this lecture was to describe the method of doing sketches necessary to go and solve the problem. The whole process of solving a problem will be described in Section six of case study. Join me there. Thank you.