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Physical Changes Every day, you see many changes around you. These changes can happen to one or more substances. In…

Acids and Bases We use many everyday items like lemon, tamarind, salt, sugar, and vinegar. Do they all taste the…

Hot and Cold Why Do We Wear Different Clothes in Different Seasons? Hot and Cold Measuring Temperature Parts of a…

Food Introduction Food Components Food has many components: Different Ways of Taking Food Amazing Fact Digestion in Humans a. The…

What Makes Things Visible? Introduction to Seeing What Makes Things Visible? Reflection of Light Laws of Reflection More to Know…

Testing Conductivity of Liquids Why is it Dangerous to Touch Electrical Appliances with Wet Hands? Testing Conductivity of Liquids Do…

Lightning In this chapter, we discuss two destructive natural phenomena: lightning and earthquakes. We will also learn how to minimize…

Sound Importance of Sound Sound is Produced by a Vibrating Body Sound Produced by Humans Voice Box (Larynx): Fun Fact…

Friction Force of Friction Factors Affecting Friction Understanding Friction Static vs. Sliding Friction Do You Know? Spring Balance Friction: A…

Force – A Push or a Pull How Objects Move Everyday Examples Force – A Push or a Pull Forces…