Question

Give scientific reasons:
1. Sharp knife cuts better than blunt.
2. School bag has provided wide straper.

Answer 1

Answer:

P(pressure) = F(force) / A(area). Hence pressure and area are inversely proportional

Explanation:

1. A sharp knife has a very thin edge to its blade. A sharp knife cuts objects better because due to its very thin edge, the force of our hand falls over very small area of the object producing a large pressure. And this large pressure cuts the object easily. On the other hand, a blunt knife has a thicker edge

2. School bags are provided with large wide straps to carry them because it increases the surface area in contact with the shoulder and reduces the pressure on the shoulders of the students

Hope the answer helps you !