# Physics I

• ## Elasticity P11205004

Consider a wire of length ‘L’ and area of cross-section ‘A’ be fixed at one end and stretched by suspending a load ‘M’ from the other end. The extension in the wire takes place so slowly that it can be treated as quasi-static change; because internal elastic force in the wire is balanced by the external applied force and hence acceleration […]

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• ## Elasticity P11205003

Volumetric stress: When the deforming forces are such that there is a change in the volume of the body, then the stress produced in the body is called volume stress. Volumetric Stress = Load / Area = Pressure Intensity = dP  S.I. Unit of stress is N m-2  or Pa (pascal) and its dimensions are [L-1M1T-2]. Units and dimensions of […]

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• ## Elasticity P11205002

Searle’s Experiment: Two identical wires A and B are suspended from a rigid support so that the points of suspension are very close to each other. Searle’s apparatus blocks are attached to the lower ends of the wires by means of chucks F1 and F2. Searle’s apparatus block consists of two metal frames P and Q. The two frames are loosely […]

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• ## Elasticity P11205001

Elasticity: The property by virtue of which material bodies regain their original dimensions (size, shape or both) after removal of deforming force is called elasticity. e.g. Rubber, Steel, Aluminum, Sponge etc. Plasticity: When a body is acted upon by deforming forces the shape and/or size of the body changes.  But, if the deforming forces are removed, the body retains its […]

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• ## Surface Tension P1206002

Angle of Contact: When the liquid is in contact with solid, the angle between the solid surface and the tangent to the free surface of liquid at the point of contact, measured from inside the liquid is called the angle of contact. When the liquid surface is curved concave upwards, the angle of contact is acute and when the liquid […]

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• ## Surface Tension P1206001

Introduction: Between any two molecules, there exists a force of attraction. This force is called the intermolecular force. The attractive force between the two molecules of the same substance is called as a cohesive force and the attraction itself is called cohesion. e.g. attraction between water and water molecules. The attractive force between the two molecules of the different substance is called […]

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• ## Scalars and Vectors P11103001

Unit – I A Introduction: Introduction to scalars and vectors Scalars: The physical quantities which have magnitude only and which can be specified by a number and unit only are called as scalar quantities or scalars. For e.g. when we are specifying time we may say like 20 seconds, 1 year, 24 hours etc. Here we are giving magnitude only i.e. […]

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• ## Gravitation P11202010

Unit – III C The concept of Gravitational Potential: The gravitational potential at a point is defined as the work done in bringing the unit mass from infinity to that point without acceleration. Gravitational potential is a scalar quantity. It is denoted by V. Its S.I. unit is J kg-1. Its c.g.s. unit is erg g-1. Dimensions of gravitational potential are [M0 […]

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• ## Gravitation P11202009

Unit – III B The concept of Gravitational Intensity: Gravitational Field: Material particle, when placed in a space, modifies the space around it. This modified space is called gravitational field. When another particle is brought in this field, it experiences a force of gravitational attraction. The gravitational field is the space around a mass or assembly of masses over which it can […]

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• ## Gravitation P11202008

Unit – III A Concept of Inertial Mass and Gravitational Mass Inertial Mass Concept: The inertial mass of a body is related to its inertia in linear motion. Let a body of mass ‘m’ moves with an acceleration ‘a’ along a straight line under the action of force ‘F’. Then By Newton’s second law of motion, Let a = 1 then […]

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