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(B) In the experiment to measure the force required to move a wooden block,it is essential that the force applied by the spring balance is horizontal

Vedclass · Accepted Answer

most accurate for $A$

Vedclass · Answer

(B) In the experiment to measure the force required to move a wooden block,it is essential that the force applied by the spring balance is horizontal to ensure that the entire force contributes to overcoming the static friction.In setup $A$,the string is pulled horizontally,ensuring the force vector is parallel to the surface.In setup $B$,the string is also horizontal,but the connection is direct and stable.In setup $C$,the use of a coiled spring can introduce vertical components of force or oscillations,leading to inaccuracies.Setup $A$ provides the most direct and horizontal application of force,minimizing errors due to alignment,thus yielding the most accurate result.

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