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Explanation:
20(a)
Pressure is the unit Force applied per unit area
20(b)
As pressure is inversely proportional to area of contact as the wider strap increases area of contact pressure on the shoulder is decreased therefore it is preferred
the or question
The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts.
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Explanation:
a) thrust per unit area is known as pressure .its SI unit is Newton metre square or Pascal
b) because in case of broad strip area increases and the pressure decreases. if we lift the bag with broad strip we feel no pain rather than a thin strip.
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