Hi guys,Here's a question which is indeed an important doubt regarding mechanics .?

Question

As we know it is more easier to use a broader tipped screwdriver rather than a thinner one.And I know it is because because larger area reduces stress.My question is what type of stress is involved there.My options are a)direct b)shear c)bending d)torsion.My teacher told that it isnt torsion.Then what could it be?I just want a simple answer with a specific reason and make sure u guys out there can answer this very simple question just within 5 minutes.Waiting eagerly 4 ur answers ,,..

Yours Asin Thottumkal

Answer 1

If "direct" stress means the same thing as bearing stress, then direct is your answer.

Answer 2

As you have told all the stresses such as Direct, Shear, Bending and torsion as applied when using a s***w driver.

But, only the shear stress accounts the most among the choices.

When you use the bigger tipped driver, the cross sectional area of the tip increases and results in greater shear stress of the tip.

Answer 3

The smaller tip causes shear stress on the sides of the slot on the head of the s***w.