Question

Explain why school bags are provide with wide straps to carrying them

Answer 1

By doing this they tries to reduce pressure per unit area which avoids the shoulder from being hurt..
Because if strap are thin they exert more pressure on shoulder and your shoulder get hurt.

Answer 2

Answer:

Larger the area of straps lesser is the pressure exerted by bag on shoulders. Hence it's easier to hold the bag with thin straps.

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