Physical Sciences Lectures
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  1. PHY102 – Electricity and Magnetism – Lecture 1

    Agbajor K. Godwin

    THE PRINCIPLE OF SUPERPOSITION OF ELECTRIC FORCES Coulombs law applies to any pair of point charges. In a situation where more than two charges are present, the net force on any one charge becomes the vector sum of the forces exerted on it by the other charges. This situation is known as the principle of superposition of electric forces.

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  2. PHY102 – Electricity and Magnetism – Lecture 2

    Agbajor K. Godwin

    ELECTRIC FIELD AND ITS STRENGTH An electric field is describe to exist at a given point if a force having an electrical origin exerts its strength on a positive test charge that is placed at that point.

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  3. PHY102 – Electricity and Magnetism – Lecture 3

    Agbajor K. Godwin

    MATHEMATICAL CONSIDERATIONS OF ELECTRIC FIELD At the end of this lesson, the students should be able to: Derive the expression for the electric field strength of a point charge; Use the expression derived above to solve problems; Extend the superposition principle to electric field.

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  4. PHY107 – Experimental Physics – Lecture 1

    Agbajor K. Godwin

    WHAT IS A GRAPH A graph is a pictorial analysis of the several results which may be obtained from a given measurement in experimental physics. The purpose of graphing in experimental physics is that it is not accurate to rely upon only one measurement for calculating a given quantity.

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  5. PHY107 – Experimental Physics – Lecture 2

    Agbajor K. Godwin

    ERROR ANALYSIS There is no experiment in physics that is totally free of errors. The reason behind this is not unconnected with the fact that we are humans and the apparatuses we are using are made by humans. Therefore, the concept of error analysis should be understood so as to make your work meaningful. Your work will not, make any sense, unless you indicate the range of your accuracy.

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  6. PHY107 – Experimental Physics – Lecture 3

    Agbajor K. Godwin

    CALCULATIONS ON EXPERIMENTAL ERRORS At the end of this lesson, the students should be able to perform calculations on various types of errors.

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  7. PHY201 – Mechanics – Lecture 1

    Agbajor K. Godwin

    NEWTONIAN MECHANICS Newtonian mechanics otherwise known as classical mechanics is that branch of mechanics where dynamical interactions of material bodies are adequately described by the famous three Newton’s laws of motion. In Newtonian mechanics, physical systems are characterised by three important assumptions.

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  8. PHY201 – Mechanics – Lecture 2

    Agbajor K. Godwin

    NEWTONIAN MECHANICSThere are some fundamental principles and defining equations in classical mechanics that are necessary to be reviewed so as to get a proper understanding of classical relativity. Recall, in kinematics, the motion of a particles is normally described by the position of its representative point in space as a function of time, relative to some chosen frame of reference or coordinate system. Using the usual Cartesian coordinate system, the position of a particle at a time t in three dimension is described by its displacement vector r, as; r = xi + yj + zk

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  9. PHY201 – Mechanics – Lecture 3

    Agbajor K. Godwin

    An Overview of Astronomy and Astrophysics The word ‘astronomy’ is an extract of the Greek words ‘astron’ meaning ‘star’ and ‘nomos’ meaning ‘law’ or ‘culture’. The two terms astronomy and astrophysics may be used interchangeably but basically, astronomy refers to the study of objects and matter outside the earth’s atmosphere including their physical and chemical properties while astrophysics refers to the branch of astronomy which deals with behaviour, physical properties, dynamic processes of celestial objects and phenomena.

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  10. PHY201 – Mechanics – Lecture 4

    Agbajor K. Godwin

    SPECIAL THEORY OF RELATIVITY In the treatment of Galilean relativity, the assumption of absolute time was a central idea. According to the concept of absolute time, two clocks initially synchronized at t = t1 = 0 will remain synchronized when they are moving relative to one another at a constant speed. A direct consequence of this assumption is that time interval measurements are invariant, Δt = Δt1, for observers in different inertial frames of reference. Similarly, simultaneous measurements of two spatial positions at an instant time results in an invariance of length, Δx = Δx1, in Galilean relativity.

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  11. PHY201 – Mechanics – Lecture 5

    Agbajor K. Godwin

    LORENTZ TRANSFORMATION The Lorentz transformation is the general linear expression which shows the relationship between time and space coordinates in different frames of reference. It is used to express the linear relation between two frames of reference namely a rest frame and a moving frame.

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