Question

Why is digging of a field is more easier with a spade of long handle than a spade with short handle?

Answer 1

When using a spade, the soil resists the blade, while the hands apply effort through the handle. A long handle increases the distance over which the effort acts from the point about which the spade turns. This produces a greater moment of force for the same effort, helping the blade cut and turn the soil with less force.