Final answer:
A horizontal restraint can involve just two people, as in the case of flicking a rope, but scenarios like tug of war or a rescue effort can involve many individuals exerting combined forces. The exact number of people required varies with the situation and the forces involved.
Step-by-step explanation:
To performorces. This requires knowledge of Newton's second law of motion to understand the overall force, acceleration, a horizontal restraint, the number of people required will vary depending on the specific context or the task at hand. In the examples provided, different scenarios involve varying numbers of people and forces applied horizontally.
For instance, if we take the example of flicking a heavy rope, it only takes two people to hold a rope stretched out horizontally for one person to flick it. However, when considering more complex scenarios such as a rescue situation described in Figure 4.40, or a tug of war mentioned in the examples, the number of people, and the forces they apply can greatly differ.
In a rescue situation, the forces on the ropes depend on their angles - the more vertical rope will support more of the person's weight, requiring an understanding of vector components and tension.
During the tug of war, we see teams of nine members each pulling with significant force, demonstrating that multiple people are required to exert large combined horizontal fand tension in the rope between the teams.