(124)As shown below, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. If F = 10N and M = 1.0 kg what is the tension in the connecting string ?

Respuesta :

The tension on the connecting string of the two blocks is 6 N.

The given parameters;

  • coefficient of friction between the surface and larger block, μ₁ = 0.20
  • coefficient of kinetic friction between the surface and smaller block, μ₂ = 0.3
  • the horizontal force, F = 10 N
  • mass of the larger block, m₁ = 2M = 2 kg
  • mass of the smaller block, m₂ = M = 1 kg

The net force on the block along the horizontal is calculated as follows;

[tex]F + \mu_2Mg - \mu_1 (2M)g = a(M+2M)\\\\10 \ + \ 0.3\times 1\times 9.8 \ - \ 0.2\times 2\times 9.8 = 3a\\\\9.02 = 3a\\\\a = \frac{9.02}{3} \\\\a = 3 \ m/s^2[/tex]

The tension on the connecting string is calculated as follows;

T = m₁a

T = (2M)a

T = 2 x 3

T = 6 N

Thus, the tension on the connecting string of the two blocks is 6 N.

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