Possible reactive cutting forces when operating a chain saw

• A. Pull in
• B. Kickback
• C. Push back
• D. Jerk

Answer: (B)

Reactive cutting forces come from how the moving chain interacts with the wood. The most dangerous and likely reaction is kickback: when the bar nose—the front tip of the guide bar—contacts a hard object or the chain binds in the wood, the chain trying to move forward while the bar pivots around that nose causes the saw to jerk upward and toward the operator. This sudden, unintended motion is why safety emphasis centers on keeping the bar nose away from nails, knots, or other obstructions and maintaining a strong, stable stance and grip so you can control the saw if it kicks.

Other terms describe related phenomena but aren’t the standard name for this specific reaction. To reduce kickback risk, use a low-kickback bar and chain, avoid cutting with the bar nose, ensure proper chain tension, and employ a chain brake during starts and repositioning.