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Concepts Of Physics MCQ Edition [Volume 1]PhysicsNewton's Laws of Motion

As depicted in the figure, a block of mass 10 kg is suspended via two light spring balances.

Options

  1. AThe individual readings may vary, but their sum will always be 10 kg .
  2. BBoth scales will display a reading of 5 kg .
  3. CThe upper scale will read 10 kg and the lower scale will read zero.
  4. DBoth scales will display a reading of 10 kg .

Correct answer

D. Both scales will display a reading of 10 kg .

Step-by-step solution

Since the spring balances are light, their masses are considered negligible. A spring balance measures the tension force acting on it. For the lower spring balance, the tension T₂ is equal to the weight of the 10 kg block. Thus, T₂ = 10g , and its reading is 10 kg . For the upper spring balance, the tension T₁ must balance the total downward force, which is the tension from the lower spring balance plus the weight of the lower spring balance. Since the lower spring balance is massless, T₁ = T₂ = 10g . Therefore, th

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