Question:
Ten one-rupee coins are put on top of each other on a table. Each coin has a mass $m$. The force on the $7^{th}$ coin (counted from the bottom) due to all the coins on its top is
Ten one-rupee coins are put on top of each other on a table. Each coin has a mass $m$. The force on the $7^{th}$ coin (counted from the bottom) due to all the coins on its top is
Updated On: Jul 7, 2022
- $3mg$, vertically downwards
- $3mg$, vertically upwards
- $7mg$, vertically downwards
- $7mg$, vertically upwards
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The Correct Option is A
Solution and Explanation
The force on $7^{th}$ coin is due to weight of the three coins lying above it.
$\therefore F = 3mg$
This force acts vertically downwards.
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Concepts Used:
Centripetal Forces
- The centripetal force makes a move on the object traveling in a circular direction and is directed towards the center upon which the object is moving.
- Centripetal force emanates from the gravitational pull and electrostatic force.
- It is a real force acting on both inertial frames and non-inertial frames.
- The centripetal force formula is
- From the object to the center is the exact direction of centripetal forces.
- The centripetal force has the tendency to turn towards the center.
- Centripetal force makes us set foot in a circular motion.