spring balcnce and weighting machine related problem questions with solutions

Showing 1–10 of 12 questions

• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  Two 1 kg masses hang on a single rope passing over two fixed pulleys, with a spring balance inserted in the horizontal section. The spring balance reads:

  

  Options

  • Option A

    10 N

  • Option B

    20 N

  • Option C

    5 N

  • Option D

    Zero

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• ParagraphdifficultNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A weighing machine is kept in a lift accelerating upward at 5 m s⁻². A block on the machine is also attached to a spring balance above. At the shown instant the weighing machine and spring balance read 15 kg-wt and 45 kg-wt respectively. Take g=10 m s⁻².

  

  Sub-question 1

  The mass of the block and the normal force from the weighing machine are:

  Options

  • Option A

    60 kg, 450 N

  • Option B

    40 kg, 150 N

  • Option C

    80 kg, 400 N

  • Option D

    10 kg, 0

  Sub-question 2

  If the lift is stopped and equilibrium is reached, the readings of the weighing machine and spring balance become:

  Options

  • Option A

    40 kg, 0

  • Option B

    10 kg, 20 kg

  • Option C

    20 kg, 10 kg

  • Option D

    0, 40 kg

  Sub-question 3

  Find the lift acceleration for which the weighing machine shows the true weight of the block.

  Options

  • Option A

    45/4 m s⁻²

  • Option B

    85/4 m s⁻²

  • Option C

    22/4 m s⁻²

  • Option D

    60/4 m s⁻²

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• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A bird of mass 0.5 kg sits in a large closed cage on a spring balance reading 25 N. The bird then flies upward inside the cage with acceleration 2 m s⁻². The balance reads:

  Options

  • Option A

    24 N

  • Option B

    25 N

  • Option C

    26 N

  • Option D

    27 N

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• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  Two spring balances S₁ and S₂ read 90 kg-wt and 30 kg-wt inside a lift accelerating upward at 10 m s⁻². The mass between them is stationary relative to the lift. Take g=10 m s⁻². Its mass is:

  

  Options

  • Option A

    60 kg

  • Option B

    30 kg

  • Option C

    120 kg

  • Option D

    None

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• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A negligible-mass pulley is suspended from a spring balance. Masses 5 kg and 1 kg hang from the two ends of a string over the pulley. During motion, the spring-balance reading is:

  

  Options

  • Option A

    6 kg-wt

  • Option B

    Less than 6 kg-wt

  • Option C

    More than 6 kg-wt

  • Option D

    May be more or less than 6 kg-wt

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• IntegerdifficultNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  An ideal spring with a pointer hangs beside a scale. A 100 N weight gives reading 40 and a 200 N weight gives reading 60. An unknown weight X gives reading 30. Find X in newtons.

  

  Your answer

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• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A massless spring balance pulls a 2 kg trolley on a horizontal surface. The reading remains 10 kg-wt during motion. Take g=9.8 m s⁻². The trolley acceleration is:

  

  Options

  • Option A

    4.9 m s⁻²

  • Option B

    9.8 m s⁻²

  • Option C

    49 m s⁻²

  • Option D

    98 m s⁻²

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• MCQdifficultNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A 60 kg person stands on a weighing machine inside a lift. The lift is moving upward but slowing down with acceleration magnitude 2 m/s². Take g = 10 m/s². The reading is:

  Options

  • Option A

    360 N

  • Option B

    480 N

  • Option C

    600 N

  • Option D

    720 N

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• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A man stands on a spring platform whose spring balance reads 60 kg-wt. If he jumps off the platform, the reading of the spring balance:

  Options

  • Option A

    First increases then decreases to zero

  • Option B

    Decreases monotonically

  • Option C

    Increases

  • Option D

    Remains same

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• MCQmediumNewtons law of motion and Frictionspring balcnce and weighting machine related problem

  A 4 kg block is suspended through two light spring balances A and B in series. Their readings are:

  

  Options

  • Option A

    4 kg and 0 kg

  • Option B

    0 kg and 4 kg

  • Option C

    4 kg and 4 kg

  • Option D

    2 kg and 2 kg

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