Question:
A uniform rigid meter-scale is held horizontally with one of its end at the edge of a table and the other supported by hand. Some coins of negligible mass are kept on the meter scale as shown in the figure. As the hand supporting the scale is removed, the scale starts rotating about its edge on the table and the coins start moving. If a photograph of the rotating scale is taken soon after, it will look closest to:
A uniform rigid meter-scale is held horizontally with one of its end at the edge of a table and the other supported by hand. Some coins of negligible mass are kept on the meter scale as shown in the figure. As the hand supporting the scale is removed, the scale starts rotating about its edge on the table and the coins start moving. If a photograph of the rotating scale is taken soon after, it will look closest to:
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In rotational motion, objects with negligible mass placed on the rotating object will move according to the inertia and rotational velocity of the system.
Updated On: Nov 18, 2025
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Solution and Explanation
Step 1: Understanding the motion.
When the hand is removed, the meter scale rotates about its edge, which is the pivot point. The coins, due to inertia, will continue to move in a straight line while the scale rotates. This results in the coins sliding along the scale as it rotates. The photograph will show the coins displaced relative to the edge of the scale.
Step 2: Conclusion.
The correct answer is option (C), where the coins are displaced due to the rotation of the scale.
When the hand is removed, the meter scale rotates about its edge, which is the pivot point. The coins, due to inertia, will continue to move in a straight line while the scale rotates. This results in the coins sliding along the scale as it rotates. The photograph will show the coins displaced relative to the edge of the scale.
Step 2: Conclusion.
The correct answer is option (C), where the coins are displaced due to the rotation of the scale.
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