A block is placed on a rough surface. It is connected to a spring balance with a string as shown.What does the reading on the spring balance represent when the block starts to move?

Frictional force between the block and the surface

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Weight of the block

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Friction coefficient of the block

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Frictional force between the block and the string

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Solution

The correct option is A Frictional force between the block and the surface

When the block is pulled with the string, the force applied by the block overcomes the frictional force at the moment when it starts moving. At that moment, the spring balance connected to the string shows the force applied by the string, which is equal to the frictional force between the block and the surface.

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