aa I was standing on a weighting machine inside a lift it recorded 50 kg wt. suddenly for few seconds it recorded 45kg wt. what must have happened during that time?explain with complete numerical analysis.
Answers
Answer:
Given:
Initially the weight machine was recording 50 kgwt. But suddenly, it weighed 45 kgwt for a few seconds.
To find:
What happened in those few seconds ?
Concept:
The weight machine actually records the Normal Reaction force. In stationary conditions, it records the weight of the body because it's in a inertial reference frame and there is no acceleration.
But when it measures 45 kgwt, it means that the normal Reaction must have been decreased . This is possible if the lift is moving downwards with an Acceleration.
Mathematical Analysis:
In stationary conditions :
mg = 50 kgwt .
In moving down conditions :
mg - F = 45 kgwt
=> 50 - F = 45 kgwt
=> F = 5 kgwt.
So the body has experienced an pseudo-force of 5 kgwt upwards because of which the recording on the machine became 45 kgwt.
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Answer:
Given:
Initially the weight machine was recording 50 kgwt. But suddenly, it weighed 45 kgwt for a few seconds.
To find:
What happened in those few seconds ?
Concept:
The weight machine actually records the Normal Reaction force. In stationary conditions, it records the weight of the body because it's in a inertial reference frame and there is no acceleration.
But when it measures 45 kgwt, it means that the normal Reaction must have been decreased . This is possible if the lift is moving downwards with an Acceleration.
Mathematical Analysis:
In stationary conditions :
mg = 50 kgwt .
In moving down conditions :
mg - F = 45 kgwt
=> 50 - F = 45 kgwt
=> F = 5 kgwt.
So the body has experienced an pseudo-force of 5 kgwt upwards because of which the recording on the machine became 45 kgwt.