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Matter In Our Surroundings
What are the uses of graphical study of motion?
Graphical representation of motion is useful to study the nature of motion of bodies. In this type of representation, time is plotted along X-axis while distance or velocity is plotted along Y-axis.
Graphs give more detailed information about the nature of motion than when motion is expressed in a tabular form.
The uses of graphical representaion of motion are:
(i) From distance-time graph the position of the body at any instant of time can be determined.
(ii) Distance covered by the body during particular interval of time can be seen from the graph.
(iii) The velocity of the body at any instant of time can be determined.
(iv) By simply looking at the graph, one can tell whether motion is uniform or not.
(v) Slope of velocity-time graph gives the acceleration of the body.
(vi) Graphs are very useful for comparing the motions of two moving bodies. Distance-time graphs easily tell when and where one body crosses the other body.
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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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