A ruler scale is balanced with two fingers, $F_{1} a n d F_{2}$ at a separation 20 cm and 40 cm from O respectively. If the person balancing the ruler tries to bring his fingers closer to the centre, which finger will slide first?

F_{1}

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F_{2}

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Both simultaneously

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Insufficient data

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Solution

The correct option is B $F_{2}$
As explained by Avinash in the previous videoclip, the farther finger will exert lower force. This will reduce the frictional force on that finger and it slides. In this case the same happens with Finger 2.

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Q. A ruler scale is balanced with two fingers,

F_{1} a n d F_{2}

at a separation 20 cm and 40 cm from O respectively. If the person balancing the ruler tries to bring his fingers closer to the centre, which finger will slide first?

A ruler scale is balanced with two fingers, $F_{1}$ and $F_{2}$ at a separation 20 cm and 40 cm from the centre of the scale O respectively. If the person balancing the ruler tries to bring his fingers closer to the centre, which finger will slide first?