The force exerted by a propeller which tends to throw the stern right or left is called __________.

Correct Answer: Option C — sidewise force

Sidewise force, often termed transverse thrust, is the lateral component of propeller force. It arises from the pressure differential across the propeller disc caused by the angle of attack of the blades against the water. This force significantly influences vessel handling, particularly during low-speed maneuvering and docking operations.