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Motion and Measurment - Coggle Diagram
Motion and Measurment
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- Oscillatory and Vibratory motion
- Periodic and Non- periodic motion
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The shortest distance between the initial and final position of a body is called displacement. Its S.I. unit is meter (m)
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Length, weight and time are considered as basic quantities for measurement and other quantities are derived from them. As per SI system; the unit of length is meter, unit of weight is kilogram and the unit of time is second.
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Measurement is an act of determining the size, amount, etc of a physical quantity using specific device.
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Before the development of standard units of measurement, people used arbitrary units of measurement. Some of them are still in use at some places. Handspan, finger-length, cubit (length between the elbow and finger tips), foot-length and arms-length are some examples of arbitrary units of measurement.
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ou have seen that arbitrary units are made up of lengths of different body parts. These lengths can vary from one person to another. This can create lot of confusion as there would be no uniformity in measurement.
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To maintain uniformity in measurement, standard units of measurement were introduced in different parts of the world at different places.
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Direct Measurement: When we measure some quantity directly, it is called direct measurement. For example; when you are using a ruler to measure a length, you are doing direct measurement.
Indirect Measurement: When we measure some quantity indirectly, it is called indirect measurement. For example; when you have to measure the girth of a tree or the length of a curve, you cannot use a ruler. You can use a rope to find the length of a curved line and then compare the length on a ruler.
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A body is said to be in motion when it changes its position with respect to its surroundings.
If the position of a body does not change with respect to its surroundings, then it is at rest.
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Uniform motion: An object is said to have uniform motion if it travels equal distances in equal intervals of time.
Example: The motion of the earth about its axis, the motion of watch hands etc.
Non-uniform motion: An object is said to have non-uniform motion, if it travels unequal distances in equal intervals of time.
Example: Motion of a train, when it approaches towards a station.
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