Determine the maximum force P that can be applied without causing movement of the 250 lb homogeneous block. The coefficient of static friction between the block and the floor is 0.4 and between the 4 ft diameter wheel and the rope is 0.2. P 3 ft 4 ft

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Determine the maximum force P that can be applied without causing movement of the 250 lb homogeneous block. The coefficient of static friction between the block and the floor is 0.4 and between the 4 ft diameter wheel and the rope is 0.2.

### Determining Maximum Force to Prevent Movement

#### Problem Statement
Determine the maximum force \( P \) that can be applied without causing movement of the 250 lb homogeneous block. The coefficient of static friction between the block and the floor is 0.4, and the coefficient of static friction between the 4 ft diameter wheel and the rope is 0.2.

#### Diagram Explanation
The accompanying diagram illustrates the setup:

- A block weighing 250 lbs, with dimensions of 4 ft in height and a base width of 3 ft, rests on a horizontal surface.
- To the left of the block, a wheel with a 4 ft diameter is depicted. 
- A rope runs over the top of this wheel and is attached to the block. The force \( P \) is applied horizontally to the left through the rope, represented by an arrow.
    
#### Parameters
- Weight of the block: \( 250 \) lb
- Height of the block: \( 4 \) ft
- Width of the base of the block: \( 3 \) ft
- Diameter of the wheel: \( 4 \) ft
- Coefficient of static friction between block and floor: \( 0.4 \)
- Coefficient of static friction between wheel and rope: \( 0.2 \)

These parameters must be considered when calculating the maximum allowable force \( P \) to ensure the block does not move.
Transcribed Image Text:### Determining Maximum Force to Prevent Movement #### Problem Statement Determine the maximum force \( P \) that can be applied without causing movement of the 250 lb homogeneous block. The coefficient of static friction between the block and the floor is 0.4, and the coefficient of static friction between the 4 ft diameter wheel and the rope is 0.2. #### Diagram Explanation The accompanying diagram illustrates the setup: - A block weighing 250 lbs, with dimensions of 4 ft in height and a base width of 3 ft, rests on a horizontal surface. - To the left of the block, a wheel with a 4 ft diameter is depicted. - A rope runs over the top of this wheel and is attached to the block. The force \( P \) is applied horizontally to the left through the rope, represented by an arrow. #### Parameters - Weight of the block: \( 250 \) lb - Height of the block: \( 4 \) ft - Width of the base of the block: \( 3 \) ft - Diameter of the wheel: \( 4 \) ft - Coefficient of static friction between block and floor: \( 0.4 \) - Coefficient of static friction between wheel and rope: \( 0.2 \) These parameters must be considered when calculating the maximum allowable force \( P \) to ensure the block does not move.
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