Question

When does the two wedge system is termed as self-locking system?

(a) If friction forces hold the block in plane

(b) If friction forces doesn’t hold the block in plane

(c) If friction forces hold the block in phase

(d) If friction forces doesn’t hold the block in phase

I have been asked this question in an online quiz.

My enquiry is from Wedges topic in section Friction of Engineering Mechanics

Answer 1

Right choice is (a) If friction forces hold the block in plane

Explanation: If friction forces hold the block in plane the two wedge system is termed as self-locking system. This is generally the concept used to lift up the boxes and then it is also used to make the very heavy works easy. Thus the wedges are very useful in the industries, and it has a wide application.