Question

Explain why school bags are provided with wide straps to carry them.

Answer 1

Hint: According to this question we have to determine why school bags are provided with wide straps in order to carry them. This question can be solved by applying the concept of pressure. Force applied per unit area can be defined as the pressure. Therefore by using this concept this question can be easily solved. When the pressure applied on the shoulder is less it is easier for children to carry them.

Complete answer:
This question can be solved by understanding and applying the concept of pressure. Force divided by area gives us the value for pressure.
Therefore, from the definition, we can imply that pressure is directly proportional to the force applied and inversely applied to the area. Therefore the larger the force applied the larger the pressure produced. Similarly, pressure applied on a large area is small and on a small area, the pressure will be large.
Therefore when the bags are produced with wide straps the area widens and therefore the pressure on the shoulder will be comparatively lower.
Bags are provided with wide straps so that the weight of the bag will spread over a large shoulder area. Therefore, this method reduces the amount of pressure on the shoulder.
Hence, when the pressure on the shoulder decreases it becomes easier for children to carry the bags.

Note:
If the straps are smaller in width then the amount of pressure on the shoulder will be large. This is because the pressure by definition is indirectly proportional to the area. This same concept is applied when nails are hammered into walls. In this, when the area of the nails is small the amount of pressure is large therefore it can be easily hammered into a wall or other spaces.