Discussion Overview
The discussion revolves around calculating the magnitude of the total contact force on a 20 kg box at rest on a rough horizontal surface under three different applied force scenarios. Participants explore the implications of different force applications and their effects on the normal force exerted by the surface.
Discussion Character
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- Some participants calculate the total contact force for case (a) as 204N, while others suggest it should be 196N based on the weight of the box.
- In case (b), one participant arrives at 213N, while the textbook states 193N, leading to uncertainty about the correct interpretation of the applied forces.
- For case (c), calculations yield 187N from one participant, contrasting with the textbook's 218N, indicating a potential misunderstanding of the vertical components of the applied forces.
- One participant questions the definition of total contact force, interpreting it as the normal reaction force, and seeks clarification on how the textbook defines it.
- Another participant suggests that free body diagrams may aid in understanding the forces involved in each scenario.
Areas of Agreement / Disagreement
Participants express differing views on the calculations of the total contact force, with no consensus reached on the correct values or interpretations of the applied forces. Multiple competing views remain regarding the definitions and calculations involved.
Contextual Notes
Participants have not provided all assumptions or definitions used in their calculations, leading to potential discrepancies in interpretations. The discussion lacks clarity on the specific definitions of total contact force and how vertical components of applied forces are accounted for.