Question

Why do school bags have broad straps?

• A. to increase pressure
• B. to reduce pressure
• C. to increase force
• D. to reduce force

Answer 1

The correct option is B

to reduce pressure

1. Pressure is defined as the force per unit area.
2. When we wear bags over our shoulders, the weights exert force on the shoulder of the person.
3. Since pressure is inversely proportional to the area and directly proportional to force, keeping the force constant i.e., the weights of books and bags together, the broader the straps the lesser the pressure.
4. It is more comfortable to carry bags with broad straps than ones with narrow straps.

Thus, bags have broader straps to reduce pressure.

Hence, option (B) is correct.