How to make?
Put the seeds in the jar.
Sew the string to the centre of the rubber sheet and put some
tape to keep it tied securely.
Stretch and tie the rubber sheet on the mouth of the jar.
Your model is ready. Now run your fingers up and down the
string by first tugging at it slowly and then rapidly.
Transparent Jar
Dried grains
Pull the string
first slowly, the
vigorously to
show movemen
of particles as it
do da
Answers
Answer:
Chapter 1
NCERT Book with important points highlighted and links to past board questions
Next Chapter
Matter in Our Surroundings
As we look at our surroundings, we see a large variety of things with different shapes, sizes and textures. Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a small drop of water or a particle of sand – every thing is matter. We can also see as we look around that all the things mentioned above occupy space and have mass. In other words, they have both mass* and volume**.
Since early times, human beings have been trying to understand their surroundings. Early Indian philosophers classified matter in the form of five basic elements – the “Panch Tatva”– air, earth, fire, sky and water. According to them everything, living or non-living, was made up of these five basic elements. Ancient Greek philosophers had arrived at a similar classification of matter.
Modern day scientists have evolved two types of classification of matter based on their physical properties and chemical nature.
In this chapter we shall learn about matter based on its physical properties. Chemical aspects of matter will be taken up in subsequent chapters.