Question

scissors used to cut iron sheet has longer wedge then the scissors used to cut cloth .why

Answer 1

Answer:

it has a greater length to reduce the effort as more the distance between the fulcrum and point of action more is the moment of force and hence the effort applied will be less.

Answer 2

Answer:

For scissor, small movement at effort(at handle) should make long movement of load arm , so that it can cut longer lengths of cloth/paper. Hence blades are longer than handle. But in metal cutting shear, we need large mechanical advantage to overcome the resistive load while cutting metal sheets.