Pulling blocks question…?

Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F. The magnitude of the tension in the string between blocks B and C is T= 3.00N . Assume that each block has mass m= 0.400kg.

What is the magnitude F of the force?

What is the tension T(AB) in the string between block A and block B?

http://session.masteringphysics.com/prob%E2%80%A6

2 Answers

  • Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F. The magnitude of the tension in the string between blocks B and C is T= 3.00N . Assume that each block has mass m= 0.400kg.

    The force, F, is causing all 3 blocks to accelerate at the same rate. The tension in the string between blocks B and C is caused by the horizontal force, F, which is pulling all 3 blocks.

    The string between blocks B and C is pulling blocks B and A. The 3.00 N force is causing the mass of B + A to accelerate.

    F = m * a

    3.00 = 0.800 * a

    Acceleration = 3.00 ÷ 0.800 = 3.75 m/s^2

    This is the acceleration of all 3 blocks!

    The horizontal force, F = (mass of 3 blocks) * 3.75

    F = 1.2 * 3.75 = 4.5 N

    T(AB) is only pulling block A.

    T(AB) = 0.4 * 3.75 = 1.5 N

    The tension force increase as more mass is being accelerated!

    Source(s): i found same q some where 30 min back and the answer is also from there only
  • Mastering Physics Pulling Three Blocks

    Source(s): https://owly.im/a0cjp

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