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Matter In Our Surroundings
What is non-uniform motion? Give some examples.
When an object covers unequal distances in equal intervals of time, the object is said to be in non-uniform motion.
the motions that we see in our daily life are usually examples of non- uniform motion.
For example, if we drop a ball from the roof of a building, we will note that the ball covers 4.9 m in the 1st second, 14.7 m in the 2nd second, 24.5 m in the 3rd second, and so on.
Here, the ball covers increasingly larger distances in successive seconds as it falls down.
Thus, the motion of a freely falling body is non-uniform.
Examples of non-uniform motion are:
(i) A stone dropped from the top of a building.
(ii) A ball thrown vertically upwards.
(iii) The motion of a train as it leaves the station.
(iv) The motion of a bus as it approaches a bus-stop.
(v) The motion of a ball rolling down an inclined plane.
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Suggest a method to liquify atmospheric gases.
Convert the following temperatures to Kelvin scale.
35°C
Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
Give reason for the following observations.
We can get the smell of perfume sitting several metres away.
What is the physical state of water at
a) 25°C
b)00C
c)1000C
What is the physical state of water at
0°C
What is the physical state of water at
100°C
Give two reasons to justify
Water at room temperature is a liquid.
Give two reasons to justify
An iron almirah is a solid at room temperature.
Why is ice at 273K more effective in cooling than water at the same temperature ?
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