Waves I: Introduction – A wave is simply a disturbance that moves through a medium. Other waves do not require a medium to travel i.e. they can travel in a vacuum, are known as electromagnetic waves e.g. radio, X-rays, gamma rays UV
Hooke’s Law: Introduction – Hooke’s law states that the extension of a spring is proportional to the applied force, provided that the force is not large enough to deform the spring permanently.– Mathematically expressed as Force α extension. Spring Constant – Since Force
Introduction: Oersted’s discovery – Hans Christian Oersted discovered the magnetic effect of a current in 1819.– The direction of the field is dependent on the direction of the current. Determining the Direction of the Lines of Force – The direction
Concave and Convex Mirrors -They are also known as spherical mirrors and are formed when a spherical glass is silvered.-If the inside is silvered a convex or diverging is formed while a concave or converging mirror is formed when the outside is silvered. Parts of a Spherical Mirror
Centre of Gravity – Centre of gravity or C.G is the point of balance of a body in which the total weight of the body seems to act. Practice Example 1 The figure below shows a uniform bar of weight
Turning Effects: Introduction – The turning effect of a body is called the moment of that force.– The turning effect produced depends on both the size of the force and the distance from the pivot.– The moment of a force
Measuring Length Using Vernier Callipers -Vernier callipers is used when higher accuracy in measurement is required and this cannot be done using a metre rule.– Vernier callipers has two scales; main scale and vernier scale. Outside jaws are used to measure both
Magnetism: Introduction – Magnets are substances that are able to attract and hold items. Magnets and Non-Magnetic Materials – Magnetic materials are those that are strongly attracted by magnets while non-magnetic ones are those that are not affected by magnets.–
Expansion of Algebraic Expressions Earlier, you read that: a(b + c) = ab + ac Example 1 Expand (2x – 3)(3x + 4) = 2x(3x + 4) – 3(3x + 4)= 6x2 + 8x – 9x -12= 6x2 – x – 12
Economic Growth This is the increase in the productivity of a country which can be seen in the continued increase in the national income over a period of years.It can be measured by taking the average percentage of increase in
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Are the abilities that allow you to write effectively and concisely. A competent...
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