20 kg B 4. The coefficients of friction are μ₁ = 0.40 and μ = 0.30 between all surfaces of contact. Determine the smallest force P required to start the 30-kg block moving. Assume the pulley to be frictionless. [Source: Beer et al., 2016]. 30 kg Guide Questions: a. Consider FBD of the 20-kg block: Is the normal force equal to the weight of the block? • What is the direction of the frictional force? Does impending tipping occur on this block? b. Consider FBD of the 30-kg block: How many frictional force(s) do we need to consider on this FBD? • What is/are the direction of the frictional force(s)? Is the normal force on the block equal to the weight of the 20- and 30-kg blocks? A

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.