Acids and Bases We use many everyday items like lemon, tamarind, salt, sugar, and vinegar. Do they all taste the same? Let’s explore their tastes! Tastes of Substances Acids and Bases Testing Acids and Bases: Indicators Special substances called indicators…
Hot and Cold Why Do We Wear Different Clothes in Different Seasons? Hot and Cold Measuring Temperature Parts of a Clinical Thermometer Precautions for Using a Clinical Thermometer Important Points Laboratory Thermometer Purpose and Range How to Use a Laboratory…
Food Introduction Food Components Food has many components: Different Ways of Taking Food Amazing Fact Digestion in Humans a. The Mouth and Buccal Cavity More to Know Sweets and Tooth Decay Salivary Glands and Saliva The Tongue b. The Foodpipe/Oesophagus…
What Makes Things Visible? Introduction to Seeing What Makes Things Visible? Reflection of Light Laws of Reflection More to Know Features of Images by a Plane Mirror Additional Information Regular and Diffused Reflection Regular vs. Diffused Reflection More to Know:…
Testing Conductivity of Liquids Why is it Dangerous to Touch Electrical Appliances with Wet Hands? Testing Conductivity of Liquids Do Liquids Conduct Electricity? Why the Bulb May Not Glow Even if the Liquid Conducts Detecting Weak Currents Making a Tester…
Lightning In this chapter, we discuss two destructive natural phenomena: lightning and earthquakes. We will also learn how to minimize their destructive effects. What is Lightning? Ancient Beliefs Ancient Greeks and Electric Sparks Understanding Electric Charges Charging by Rubbing Types…
Sound Importance of Sound Sound is Produced by a Vibrating Body Sound Produced by Humans Voice Box (Larynx): Fun Fact Sound Needs a Medium for Propagation How Sound Travels Sound in Different Mediums Summary We Hear Sound through Our Ears…
Friction Force of Friction Factors Affecting Friction Understanding Friction Static vs. Sliding Friction Do You Know? Spring Balance Friction: A Necessary Evil Friction: Our Helper and Trouble-Maker The Downside of Friction Increasing and Reducing Friction Increasing Friction on Purpose Reducing…
Force – A Push or a Pull How Objects Move Everyday Examples Force – A Push or a Pull Forces are due to an Interaction Exploring Forces Key Points Think It Over More to Know Force and Motion A Force…
Adolescence and Puberty Introduction Adolescence and Puberty Changes at Puberty A. Increase in Height B. Change in Body Shape C. Voice Change D. Increased Activity of Sweat and Sebaceous Glands E. Development of Sex Organs F. Mental, Intellectual, and Emotional…
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