BY Neha arora DEPARTMENT OF APPLIED SCIENCES
Science is around us everywhere. The water you are drinking has science in it; the house you are living in has science in it. Anywhere you go, whatever you do sciences will surely going to help you. When we talk about the educational science, there are many other subjects which come under science. These subjects are called branches of science. Some of them are physics, chemistry, biology, astrology, etc. Physics is more than an abstract area of research, it is also a powerful lens through which to view the everyday world. Everyday phenomena, toys and puzzles offer many interesting challenges and some lead to deep, interesting problems, especially in nonlinear science and mathematics. And they remind us why we got into Physics in the first place If you've ever wondered what makes lightning, why a boomerang returns, how ice skaters can spin so fast, how Michael Jordan can "fly," why waves crash on the beach, how that tiny computer can do complicated problems, or how long it takes light from a star to reach us, you have been thinking about some of the same things physicists study everyday. Physicists like to ask questions. They try to find answers for almost everything from when the universe began to why soda fizzes. If you like to explore and figure out why things are the way they are, you might like physics. Let us have a glance at the wonders and glimpses of Physics in our day to day life with reference to some instances and phenomena whose explanation can be made possible only with the help of Physics.
What happens when sheets of paper, long rolled up into a tube,
are unrolled but simply won't ever lie flat again?
Paper consists mostly of cellulose, a natural polymer (i.e. plastic) built by stringing together thousands of individual sugar molecules into vast chains. Like the sugars from which it's constructed, cellulose's molecular pieces cling tightly to one another at room temperature and make it rather stiff and brittle. Moreover, cellulose's chains are so entangled with one another that it couldn't pull apart even if its molecular pieces didn't cling so tightly. These effects are why it's so hard to reshape cellulose and why wood or paper don't melt; they
burn or decompose instead. In contrast, chicle — the polymer in chewing gum — can be reshaped easily at room temperature. Even though pure cellulose can't be reshaped by melting, it can be softened with water and/or heat. Like ordinary sugar, cellulose is attracted to water and water molecules easily enter its chains. This water lubricates the chains so that the cellulose becomes somewhat pliable and heat increases that pliability. When you iron a damped cotton or linen shirt, both of which consist of cellulose fibers, you're taking advantage of that enhanced pliability to reshape the fabric.But even when dry, fibrous materials such as paper, cotton, or linen have some pliability because thin fibers of even brittle materials can bend significantly without breaking. If you bend paper gently, its fibers will bend elastically and when you let the paper relax, it will return to its original shape.However, if you bend the paper and keep it bent for a long time, the cellulose chains within the fibers will begin to move relative to one another and the fibers themselves will begin to move relative to other fibers. Although both of these motions can be facilitated by moisture and heat, time along can get the job done at room temperature. Over months or years in a tightly rolled shape, a sheet of paper will rearrange its cellulose fibers until it adopts the rolled shape as its own. When you then remove the paper from its constraints, it won't spontaneously flatten out. You'll have to reshape it again with time, moisture, and/or heat. If you press it in a heavy book for another long period, it'll adopt a flat shape again.
Why does combining red, green, and blue light create white