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Physics and measurements are mostly related to our day to day life activities. Physics is the branch of science which deals with the study of nature and its laws. For example, the orbiting of the moon around the earth, falling off an apple from a tree and tides in the sea on a full moon night can all be explained if we know Newton's law of gravitation and Newton's laws of motion. Physics is concerned with the basic rules which are applicable to various domains of life. We use measurement in our daily life and it makes easier for us to understand the basics about physical quantities.
Everyone is his life once must have gone to the market to purchase groceries and vegetables. Suppose you go to the market to buy potatoes, then the vegetable vendor will ask you how much quantity do you want and you tell him that you want 5 kg.
This 5 kg is the mass of the potatoes. If you go to buy milk, you will buy it in liters. If you buy clothes, you buy those in meters. You will also study dimensional analysis to check for errors in equations.
The mass can be measured using the weighing machine like this, Similarly, length can be measured using scale, measuring tapes, etc. We will be able to measure the size of an object and determine the units, dimensions, formulas of physical quantities.
After measuring these values, we will learn about how to calculate errors in our measurement and we can check the accuracy of our calculations.
Now we will discuss the important topics along with an Overview of the chapter. After that, we will see the important formulas related to this chapter. In physics and measurement, we will get to know about physical quantities and their different types.
Here we will measure and compare the same kind of physical quantities with the help of numbers and units. These numbers and units together form a physical quantity. We all know that a car is much heavier than a bicycle but exactly how many times? This can be easily answered if we have chosen a standard mass and call it unit mass.
If the car is times heavier than the unit mass and the bicycle is 30 times, we will get to know that a car is 10 times heavier than the bicycle. Thus, the physical quantities are can be expressed in terms of a unit of that quantity.
The measurement of the quantity consists of two parts,i. In this chapter, we will study standard units of fundamental physical quantities like length, time, mass, temperature and about derived quantities which can be expressed in terms of fundamental quantities. We will study about dimensional analysis of quantities and after that, we will be able to check whether the given formulas of any quantity are correct or not.
Suppose you measure something and get an error in that measurement, then after studying this chapter you will be able to find the error in your measurements.
You will learn how to find the dimensions of any derived physical quantities with the help of fundamental quantities. To denote dimensions we write it within the brackets.
For Example:- if we have to find the dimension of Force in terms of fundamental quantities, then we can derive it like this For example, suppose there is a rod of length 6 cm and you are asked to measure the length of that rod using a scale.
When you measure the length, it comes out to be 5. This is how you will calculate the error and there are also other methods to calculate the errors which you will learn in this chapter.
First, you should have a basic idea about various measurement units of different physical quantities like length, mass, time. Also, you should have an idea about SI units and practical units like liters, ton, etc.
Please try to remember the most used formulas and units of quantities by practicing the questions and watching video lectures on each concept. Practice enough problems of finding dimensions, units, error measurement so that it becomes easy to remember different formulas. How to Solve Questions of Physics and Measurements:.
For example- Mass is denoted by M, length by L, time by T. To find the dimension of a physical quantity, express that quantity in terms of basic quantities as the product of different powers of the basic quantities and the result that we obtain after the product is the dimension. For example Dimensions of , where symbols and have their usual meaning, are:. This can be solved using the relation of speed of light. And using the dimensions found, you can easily find the unit of quantities.
One can also find the dimension of a physical constant like gravitational constant, Planck's constant by substituting the dimensions of physical quantities in a given equation. If yes, then that relation is dimensionally correct. To convert a physical quantity from one system to the other, use the concept that the measure of a physical quantity is always constant.
To derive new relations or formulas for a physical quantity as a function of some fundamental quantities, assume that the physical quantity is proportional to basic quantities raised to some power and then equate all the quantities Hindi 10th Ncert Notes Javascript on both sides of the equation to find the values of the power. You can solve all these questions with proper study and once you start solving examples of these topics. Always do the calculations with proper concentration and neatly to avoid getting confused.
This chapter mostly requires practicing and memorizing of formulas and units. You can also remember the dimensions if you practice enough questions. Questions asked from this chapter are mostly related to finding dimensions, conversions and find errors in measurement. Study the process of solving questions first and practice some examples. Solve previous year question of various exam from this chapter. Make a plan to prepare for this chapter and Stick to a Timetable.
Because as said by Carl Sandburg:. You and you alone will determine how that coin will be spent. Be careful that you do not let other people spend it for you. Then you can do questions from Understanding Physics by D.
Pandey or H. Both of these books have good quality questions. But apart from these books, you should also give topic-wise online mock tests.
Chapters No. Chapter Name. Chapter 2. Chapter 3. Laws of motion. Chapter 4. Work Energy and Power. Chapter 5. Rotational Motion. Chapter 6. Chapter 7. Properties of Solids and Liquids. Chapter 8. Kinetic theory of Gases. Chapter 9. Chapter Oscillations and Waves. Current Electricity. Magnetic Effects of Current and Magnetism. Electromagnetic Induction and Alternating currents. Electromagnetic Waves. Dual Nature of Matter and Radiation. Atoms And Nuclei. Electronic devices. Communication Systems.
Experimental skills. Most of the previous year's questions from this chapter are from dimensional formulae and dimensional analysis. This questions can be solved easily if the physics course is completed. No need for memorizing all dimensional formula.
Dimensional formulae can be derived from basic equations easily. For example. This can be solved using:. For Example- calculation of absolute error for a set of readings of the period of a simple pendulum etc. Let's Ncert 10th Science Notes Pdf Viewer see another example from Errors.
The maximum percentage error in the value of A will be :. This can be solved using the concept :.
Along with, for a little diversion ideas, pseudonyms or fake identities. Guantee which a plywood is ??-inch not as big than a tangible measurements of a chair as well as a gaunt behind. I was upon a vessel upon my .
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