Introduction We say that an object is in motion when its position changes with time. To describe the position of an object we need to specify a reference point called the origin. Motion along a Straight Line Distance: Total ground covered by an object during its motion between any two points. Displacement: The shortest distanceContinue reading “Chapter 08––>Motion”
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Chapter 09 ––>Force and Laws of Motion
In our everyday life we observe that some effort is required to put a stationary object into motion or to stop a moving object. By pushing, hitting and pulling objects we are bringing objects in motion. They move because we make a force act on them. We know that force can be used to provideContinue reading “Chapter 09 ––>Force and Laws of Motion”
Chapter 10––>Gravitation
Introduction If earth can attract an apple why not moon or other celestial bodies? If moon is attracted by earth why it does not fall towards it? Why earth is not moving towards apple? These are some questions which came to Newton when he saw an apple falling from a tree. He conjectured that theContinue reading “Chapter 10––>Gravitation”
Chapter 10–>Light; Reflection and Refraction
Topics In this Chapter Light Nature of Light Light incident on another medium Characteristics of light Properties of light Reflection of light by other media Laws of Reflection Propogation of light Fermat’s Theorem Characteristics of Images Image formation by a plane mirror Principle of Reversibility of light Spherical mirror Relationship between focus and radius ofContinue reading “Chapter 10–>Light; Reflection and Refraction”
Chapter 11––>Work and Energy
Introduction In day-to-day life, we consider any useful physical or mental labor as work, which is being defined differently in science. Two conditions are need to be satisfied for work to be done in science :- A force should act on object. The object must be displaced. If either of these conditions does not satisfy,Continue reading “Chapter 11––>Work and Energy”
Chapter 12––>Sound
Introduction Have you heard the following sounds – Sitar, Violin, Veena, your favorite song playing in your iPod, temple bells, chirping of birds, vehicles horning in traffic, dogs bark, pressure cooker whistling, crackers bursting, rattling and breaking of objects etc. While some sounds may be pleasant and soothing, some could be annoying. In this chapter, we willContinue reading “Chapter 12––>Sound”
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