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Class 9 Physics Krishna performs an experiment to establish the relation between weight of a rectangular wooden block lying on a horizontal surface and minimum force required to jsut move it using a spring balance. If the weight of the wooden block is 300 gwt and two known weights of 100 gwt each are to be successively plcaed on the wooden block to take more readings, then which one of the following spring balances would you select to obtain best result. It is known that a force of 90 gwt is required to just move the block on the surface. (a) Range 0-100 gwt; least count 1 gwt (b) Range 0-200 gwt; least count 2 gwt (c) Range 0-250 gwt; least count 2 gwt (d) Range 0-500 gwt; least count 2 gwt Give reason for your answer.

Class 9 Physics
Krishna performs an experiment to establish the relation between weight of a rectangular wooden block lying on a horizontal surface and minimum force required to jsut move it using a spring balance. If the weight of the wooden block is 300 gwt and two known weights of 100 gwt each are to be successively plcaed on the wooden block to take more readings, then which one of the following spring balances would you select to obtain best result. It is known that a force of 90 gwt is required to just move the block on the surface.
(a) Range 0-100 gwt; least count 1 gwt
(b) Range 0-200 gwt; least count 2 gwt
(c) Range 0-250 gwt; least count 2 gwt
(d) Range 0-500 gwt; least count 2 gwt
Give reason for your answer.

Grade:11

1 Answers

Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
9 years ago
Dear student,
The weight of the woonden block is 300 gwt and then over that two weights each of 100 gwt are placed, then the net weight would become 500 gwt. So, a spring balance having a range between 0 to 500 gwt should be selected to get the result.
Regards
Sumit

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