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A block is at rest on the incline shown in the gure. The coefficients of static and kinetic friction are 0.6 and 0.51, respec- tively The acceleration of gravity is 9.8 m/s 29° What is the frictional force acting on the 46 kg mass?

Respuesta :

Normal reaction force on the block while it is at rest on the inclined plane is given as

[tex]F_n = mgcos\theta[/tex]

here we know that

m = 46 kg

[tex]\theta = 29^o[/tex]

now we will have

[tex]F_n = 46*9.8*cos29 = 394.3 N[/tex]

now the limiting friction or maximum value of static friction on the block will be given as

[tex]F_s = \mu_s * F_n[/tex]

[tex]F_s = 0.6 * 394.3 = 236.56 N[/tex]

Above value is the maximum value of force at which block will not slide

Now the weight of the block which is parallel to inclined plane is given as

[tex]F_{||} = mg sin\theta[/tex]

here we know that

[tex]F_{||} = 46*9.8 sin29 = 218.55 N[/tex]

Now since the weight of the block here is less than the value of limiting friction force and also the block is at rest then the frictional force on the block is static friction and it will just counter balance the weight of the block along the inclined plane.

So here friction force on the given block will be same as its component on weight which is 218.55 N

onyebuchinnaji

The frictional force acting on the block is 236.67 N.

The given parameters;

  • coefficient of static friction, [tex]\mu_s[/tex] = 0.6
  • coefficient of static friction, [tex]\mu_k[/tex] = 0.51
  • inclination angle plane, θ = 29⁰
  • mass of the block, m = 46 kg

The normal force on the block is calculated as follows;

[tex]F_n = W \times cos(\theta)\\\\F_n = mg \times cos(\theta)\\\\F_n = 46 \times 9.8 \times cos(29)\\\\F_n = 394.45 \ N[/tex]

Since the block is at rest, the static frictional force acting on the block is calculated as follows;

[tex]F_s = \mu_s F_n\\\\F_s = 0.6\times 394.45\\\\F_s = 236.67 \ N[/tex]

Thus, the frictional force acting on the block is 236.67 N.

Learn more here:https://brainly.com/question/4515354

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