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Class 8, Physics We shall study about Lightning and Earthquake in detail Lightning Lightning occurs because of the massive electric charge flowing from clouds, from one part of cloud to another or from a cloud to ground. Electrostatic Force: Rubbing a comb against dry hair / rubbing a balloon against…
Stars and Solar System We are not able to see the back side of the moon? Why? Phases of the Moon: The day today changes in the shape of the moon as seen from the earth is called as phases of the moon. There are 6 Phases 1. New moon…
Define Friction?? What are the Causes of Friction?? Write a short note on Spring Balance?? Working Principle: List the various types of Friction?? There are Three types of friction Static friction: The opposing force that comes when one object tends to move over the surface of another but the actual…
What are the most important natural resources? Air and Water Define Pollution?? Contamination of natural resources like air and water by addition of toxic and poisonous substance due to various human activities is called Pollution. Define Pollutant and give some examples?? When does a substance become pollutant?? Define Air Pollution??…
Force and Pressure Summary: Force: Force Classification: Specific Non-Contact Forces: Pressure: Applications of Pressure: Pressure on Liquids: Applications of Liquid Pressure: Atmospheric Pressure: Astronauts and Space Suit: What is a Force?? Push or pull of an object is called as force. What are the effects of Force? Force can cause…
Grade 8, Physics Tuning fork: How do sound travels?? Define Medium?? Speed of the sound: Speed of the sound in Sound travels in the form of waves Waves are characterized by frequency amplitude and time period Simple pendulum It consist of a small metal Bob suspended by long thread from…
Define light? Define Reflection? Reflection is the phenomenon of bouncing back of light in the same medium in which it was travelling when it falls on the surface. Important terms Incident ray The Ray of light that falls on the mirror reflecting surface is called Incident ray. Point of incidence…