Physics, science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe. In the broadest sense, physics (from the Greek physikos) is concerned with all aspects of nature on both the macroscopic and submicroscopic levels.
Its scope of study encompasses not only the behaviour of objects under the action of given forces but also the nature and origin of gravitational, electromagnetic, and nuclear force fields. Its ultimate objective is the formulation of a few comprehensive principles that bring together and explain all such disparate phenomena. |
Chapter 16: ElectrostaticsElectrostatics is the study of electromagnetic phenomena that occur when there are no moving charges, in example, after a static equilibrium has been established.
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Chapter 17: Electricity Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge.
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Chapter 18: Heat Energy TransferHeat energy is the result of the movement of tiny particles in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.
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Chapter 13: Density
Density is the mass per unit volume. It can be measured in several ways. The most accurate way to calculate the density of any solid, liquid or gas is to divide its mass in kilograms by its volume (length × width × height) in cubic metres.
Density can be found using the equation:
Density can be found using the equation:
Not all objects have regular volumes that are easy to measure. A ‘eureka can’ can be used in these cases. This uses the concept of Water displacemenet method.