Question

What does the reading of the spring balance indicate when the brick just begins to move?

Answer 1

Answer:

reading of spring balance indicates that the force of friction has decreased.

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Answer 2

Answer:

This reading of spring balance is smaller than the first reading of spring balance indicating that the force of friction has decreased. Wrapping of polythene sheet makes the surface of bricks smooth due to which the friction with floor decreases.

Explanation:

They are used when the accuracy afforded by other types of scales can be sacrificed for simplicity, cheapness, and robustness. A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring.