Final answer:
You should never use a circular saw without a blade guard because it poses a safety risk and increases the chance of accidents and injuries.
Step-by-step explanation:
The reason you should never use a circular saw without a blade guard is because it poses a serious safety risk. The blade guard is a protective covering that prevents direct contact with the spinning blade. Without a blade guard, there is a higher chance of accidents and injuries, such as lacerations or amputations. For example, if your hand slips or the wood you're cutting shifts, the exposed blade could come into contact with your body.
Furthermore, a circular saw without a blade guard increases the likelihood of kickback. Kickback occurs when the saw blade catches the wood and forcefully throws it back towards the operator. This sudden movement can result in loss of control and potential injury.
In summary, using a circular saw without a blade guard is extremely dangerous and should be avoided to prevent accidents and injuries.