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Matter In Our Surroundings

Question
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Define the term speed. What are its various units? Is it a scalar or vector quantity?

Solution

Speed is defined as the distance travelled by a body per unit time.
Thus,
Speed space equals space fraction numerator Distance space travelled over denominator Time space taken end fraction space space space space space space space space space space space box enclose straight v space equals space straight s over straight t end enclose

The SI unit of speed is ms-1 whenever the distance covered by body is expressed in metre and time in second.
A smaller unit of speed is cm s-1.
A larger unit of speed is km h-1. 
Speed is a scalar quantity because it has only magnitude and no direction.
The speed of a body tells us how fast or how slow the body is moving. But it does not give the direction of motion.

Some More Questions From Matter In Our Surroundings Chapter

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 ?

What produces more severe burns, boiling water or steam ?

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