By Mrs. Nudrat Iqbal Syndicate -3 DA SKBZ College

Contents  Introduction  Motivational questions  Demonstration and lecture  Activity  Mathematical Expression  Assessment  Assignment  Links/ references

Introduction  Recap on definitions of volume and mass  Display of samples as cotton, rice, iron nails and aluminum foil  What is the significance of recording data as mass, volume and density

Bloom’s taxonomy

Bloom’s Taxonomy S.no. Title of Objectives Learning Objectives 1. Remembering Definition and explanation of density What is density? What are its units? 2. Understanding Demo. To test various object for floating and sinking in water Tell which of these are less dense? Ice or water; oil or water; iron block or water 3. Applying Numerical problems Calculate density of 4cm 3 of an iron piece that weighs 14 g. What will be the mass of an ice cube whose density is 1g/cm 3 and volume of 1cm 3 ? ?

4. Analyzing Reasoning, that affect of density on floating things? 10g of iron block will sink in water? How can you make it less dense? 5. Evaluating Practical/experiment 10 nails of 1g each will sink in water but a foil of same mass (10g) will float. Explain it? 6. Creating Project Take aluminum of same mass and form it into various shapes (sphere, cuboids, laminar. Test which one will float?

Motivational Questions  Why does ice or oil floats on water?  Have you noticed that iron nails sink in water but tons of iron (ships) do not sink?  Why do bags of same size containing cotton and rice do not have same mass?

Demonstration and lecture Term density will be defined and explained Some amount of rice and cotton will be kept in same sized bags and weighed Facts and reasons will be discussed and explained to elaborate the concept

Activity Buoyancy Check: Floating and sinking of Al foil and then lump of same foil Floating ship: Discussion on the reasons on floating tons of metallic structure I.e. ships

Floating eggs Take a raw egg. Immerse it in water. It will sink to the bottom. Ask the students to predict the condition in which it can float. The egg can float if the water in the beaker becomes denser. Add about ten teaspoons of salt to 175 mL of water,stir well and immerse the egg. The egg will float. Discuss and evaluate the reason.

Mathematical expression Expression of density Notational form SI units for the term Numerical problems for eliciting the concept

Written quiz and numerical problems Define density with its SI units. Calculate density of 10cm 3 wooden block whose mass is 40g.

References bbc.bitesize Elementary science 8