TOPIC 6: MOTION IN STRAIGHT LINE Motion is the change of position of an object from one place to another. It is the study of the movement of a body from one point to another. It studies of all aspects of motion including distance and displacement, speed and velocity, acceleration and deceleration e.t. c. There are two types of motions; Circular motion- Is the motion of an object in a circular path. Examples; Motion of the electron around the nucleus of an atom, Revolutionary movement of the earth around the sun, Motion of a car around a cornered road. Linear…
Author: Msomi Bora
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TOPIC 5: SIMPLE MACHINES A simple machine is a non-powered mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. A simple machine uses a single applied force to do work against a single load force. Ignoring friction losses, the work done on the load is equal to the work done by the applied force. Concept of Simple Machines Nowadays man can do many things without necessarily using much of his own energy. Many can fly by using aeroplane,…
TOPIC 4: FORCES IN EQUILIBRIUM Moment of a Force The Effects of Turning Forces Explain the effects of turning forces A force is a push or pull which when applied to a body it will change its state either by stopping it if it was in motion or making it move if it was at rest. If a body under the action of a net externalforceis allowed to rotate about a pivot, the body will tend to turn in the direction of the applied force. Examples of turning effect…
TOPIC 3: MAGNETISM Concept of Magnetism The Origin of Magnetism Explain the origin of magnetism Chinese were the first to use the metal magnetite called lodestone. A Lodestone was capable of attracting small iron pieces and it was used as a crude navigation compass by Greeks. Lodestones were the earliest magnets. Iron, nickel and cobalt are the only naturally occurring magnetic materials. Magnet has two ends known as magnetic poles in which the greatest attraction power is concentrated. Magnetic and Non-magnetic Materials/Substances Identify magnetic and non-Magnetic material/substances Magnetic substances These are substances which have a property of being attracted by a magnet.E…
TOPIC 2: CURRENT ELECTRICITY Electric current is the rate of charge flow past a given point in an electric circuit, measured in Coulombs/second which is named Amperes. In most DC electric circuits, it can be assumed that the resistance to current flow is a constant so that the current in the circuit is related to voltage and resistance by Ohm’s law. The standard abbreviations for the units are 1 A = 1C/s. Concept Of Current Electricity Current Electricity Define current electricity Current electricity is a fundamental quantity and is the amount of charge passing a given point in a circuit…
TOPIC 1: STATIC ELECTRICITY Concept of Static Electricity The Concept of Static Electricity Explain the concept of static electricity Static electricity refers to the accumulation of electric charges on the surface of an object. These charges are in a stationary state (at rest). The study of electric chargers at rest is known as electrostatics. It studies about the charges at stationary state. These charges can be moved away from the object y means of electric current when connected to the circuit. The Orign of Charges Explain the origin of charges The knowledge of static electricity came as early as the…
TOPIC 9: LIGHT Sources of Light The Concept of Light Explain the concept of light Light if a form of energy. It is a kind of energy which can stimulate our eyes and make us see things around us. Light can carry both energy and information. Light energy can travel in vacuum and at very high speed of about 300,000,000 m/s. By definition, light is the form of energy which stimulates the sensation of our vision. It is not possible to see objects without light. In order for our eyes to see objects, light must come from the objects to…
TOPIC 8: WORK, ENERGY AND POWER Work The Concept of Work Explain the concept of work Work is said to be done only if the application of a force makes a body move from one point to another. If a person pushes a wall and without making it move, even if the person sweat and physically become tired, he would not have done any work. But if the person pushes a trolley and the trolley moves then work is said to be done. Work is defined as the product of the force applied and the distance moved in the direction…
TOPIC 7: PRESSURE Concept of Pressure The Concept of Pressure Explain the concept of pressure Pressure is defined as the force per unit area. Mathematically, the force discussed here is the force which acts normally or perpendicularly to a unit surface area. That is to say, pressure depends on the force applied and the surface area. The S.I Unit of Pressure State the S.I unit of pressure The SI unit of Pressure is Newton per square metre (N/m2). This unit is usually referred to as the Pascal (Pa). However, due to the fact that measurement of pressure may result to…
TOPIC 6: STRUCTURE AND PROPERTIES OF MATTER Structure of Matter State of matter is defined in terms of the phase transitions which indicate the change in structure and properties. Solids, liquids and gases all are made up of microscopic particles. The behavior of all these particles also varies in three phases. The Concept of Matter Explain the concept of matter Matter is anything that has mass and occupies space. In other words, matter is anything that has weight and volume. For example, stone is considered a matter because it has mass and it occupies space. Therefore, everything we see around…