It treats magnetism first and then electricity. This unit is made up of two main topics called electricity and magnetism. 7.2 Production and Transmission of Sound.All the above-mentioned sounds stimulate your ears and make you recognize the sources of sound and the messages sent through sound. The sound of cars, the barking of dogs, friends chatting, a teacher talking, and music are some examples of sound. You hear different sounds throughout the day. One of the most commonly observed phenomena in nature is sound. The unit also presents temperature measuring instruments (scales), conversion of temperature scales, sources of heat, and effects of heating. This unit introduces the concept of temperature and discusses the differences between temperature and heat. In this unit, you will learn the fourth basic physical quantity called temperature. So far, you have studied three basic physical quantities mass, length, and time. 5.2 Mechanical Advantage, Velocity Ratio and The efficiency of Machines.To understand the purposes of machines, you need to revise the concepts of force, work, weight, ratio, and percentage, because you often use them in this chapter. Group the following devices as machines or not machines: knife, scissors, screw, computer, bottle opener, axel, typewriter, electric motor, lever, pulley, and wedge. 4.3 Transformation and conservation of energy.
In this unit, you will learn the concepts of work, energy, power, and the relationship among them. In the last three units, you learned some properties of physical quantities, measurements of physical quantities, their SI units, the motion of bodies, force, and the relationship between force and motion. The concepts such as speed, velocity, and acceleration are used for describing various types of motion around you. In unit two of this book, you learned important concepts that describe motion. UNIT 3: FORCE AND NEWTON’S LAWS OF MOTION 2.3 Qualitative Exploration of Constant Velocity and Accelerated Motion.These concepts are distance, displacement, speed, velocity and We use some basic concepts when we express motion. Motion is one of the key topics in physics. In this unit, you will be introduced to the basic concepts and relationships in motion.
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