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

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

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

20 kg
B
4. The coefficients of friction are µs = 0.40 and μk = 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?
Answer: P = 353.2 N
A

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