SYND 7-3-74 PRIME MINISTER VORSTER MEETS AFRICAN LEADERS TO STUDY WAGE GAP

The video tutorial introduces the term 'Sharp' and explains the context and process of 'starting knocking.' It provides a brief overview of these concepts, aiming to clarify their meanings and applications.

In what situations might someone start knocking?

How might the duration of knocking affect the response of the person inside?