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| Introduction - Physical world and Measurement |
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| Physics is sometimes called as 'science of measurement'. The acceleration produced by a force for the motion of a body can be known by measuring the magnitude of applied force and mass of the body. Similarly, the distance of a stone covered, when thrown horizontally, can be measured by knowing its initial speed, time taken by it to cover the distance and acceleration in its motion. As told by Lord Kelvin, "If we can measure what we are speaking about and express it in a value, then we know something about it, else our knowledge is limited." So, to understand physics completely, it is necessary to measure quantities like speed, time, mass and force. |
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