CLASS IV DS LESSON 1 EXERCISE

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Equation of motion by graph

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MOTION Equations of motion by graphical method We already know about equations of motion when an object moves along straight line with uniform acceleration. We already know how to derive them but these equations can also be derived by graphical method. a. Equation for velocity time relation Consider the velocity-time graph of an object that moves under uniform acceleration as shown below in the figure 7. From this graph, you can see that initial velocity of the object is  u u  (at point A) and then it increases to  v v  (at point B) in time  t t . The velocity changes at a uniform rate  a a . Again from figure it is clear that time  t t  is represented by OC , initial velocity  u u  by OA and final velocity of object after time  t t  by BC. From graph as given in figure 7 it is clear that  B C = B D + D C = B D + O A B C = B D + D C = B D + O A . So we have  v=BD+u     ...
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Chapter 1 (Motion)

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Mirror and it's types

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Mirrors A mirror is a reflective surface that does not allow the passage of light and instead bounces it off, thus producing an image. The most common mirrors are flat and called plane mirrors. These mirrors are made by putting a thin layer of silver nitrate or aluminium behind a flat piece of glass. When you place an object in front of a mirror, you see an image of the same object in the mirror. The object is the source of the incident rays, and the image is formed by the reflected rays. An image formed by reflection may be real or virtual. real image -  A “real” image occurs when light rays actually intersect at the image, and become inverted, or turned upside down. virtual image-  A “virtual” image occurs when light rays do not actually meet at the image. Instead, you “see” the image because your eye projects light rays backward. A virtual image is always upright. Differences between Real Images and Virtual Images S No. Real image Virtual image 1. A real...
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