Question

Explain why scissors for cutting cloths may have blades longer than handles but shears have shorter blades and long handles

Answer 1

It all depends on torque and lever and fulcrum.

Cut cloths does not require too much precision but need more power from us as the cloth may be thick. By keeping the blades long and handles short, the torque is 'shifted' in such a way because of unequal lengths between the fulcrum that it becomes easier for us to apply little force and still the cloth can be cut easily. But using such scissors we do not get the required finesse.

Shears work in the exactly opposite way. Here we need to apply greater force to make a small cut as it has application in situations which require finesse. This also helps to decrease the chances of wrong cutting as small force applied foes not result in drastic cuts unlike that in scissors used to cut cloths.

Actually, if we use such a scissor and a shear of equal weights, we would get more easily tired using the shear.

Answer 2

Answer:

Explanation:

A pair of scissors for cutting cloth may have blades longer than the handles because it's effort arm is shorter than the load arm so that the blades move longer on the cloth when the handles are moved a little whereas shears for cutting metals have short blades and long handles because their effort arm is longer than the load arm which enables us to overcome a large resistive force by a small effort.