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GRADE VII SCIENCE CHAPTER: HEAT ( PART-II) Students, today we will discuss the following topics of the Chapter: Heat. Ø   Flow of heat Ø   Conduction Ø   Conductors & Insulators Ø   Convection Ø   Sea breeze Ø   Land breeze Ø   Radiation You will be provided with a video link of YouTube that will help you to understand it better. Most of the topics of this chapter are explained in the written form, as follow:   FLOW OF HEAT Students, do you know why the mercury in a thermometer rise when you place it under your tongue? This is because it gets heated and expands. The heat from your mouth flows to the glass bulb to the mercury. Heat can flow or travel through solids, liquids, gases and even through space. However it travels differently in different materials. There are three different ways in which heat travels: a)     Conduction b)     Convection c)     Radiation   CONDUC...

  WORK,ENERGY AND POWER Q1. A force of 6 N acts on a body of mass 3 kg producing a displacement of 10 m. The work done by the force is a.       18 J b.       30 J c.        60 J d.       36 J        Q2. A body acted upon by a force of 25 N acquires acceleration of 2.5 ms-2 and covers a distance 10 m. If the body starts from rest then what is the kinetic energy acquired by it? a.       25 J b.       250 J c.        75 J d.       100 J        Q3. A body at rest cannot have a.       Potential energy b.       Kinetic energy c.        Electrical energy d.       Both A and B Q4. Which would have greater imp...