A slow start and a quick stop of the bridge is the best way to prevent the load from swinging.

A slow start and a quick stop of the bridge is the best way to prevent the load from swinging.

• A. True
• B. False
• C. Not sure
• D. N/A

Answer: (B)

Swing is driven by horizontal impulses, so the way you start and stop the load matters. The load behaves like a pendulum, and any abrupt change in motion can set it swinging. A slow start helps limit the initial momentum, but stopping quickly creates a strong decelerating impulse that can drive the load to swing in the opposite direction. The safer, more effective approach is to move the load with smooth, gradual acceleration and then decelerate gradually to a stop, allowing the swing to decay rather than be amplified. That’s why slow start with a quick stop is not the best way to prevent swinging.

Swing is driven by horizontal impulses, so the way you start and stop the load matters. The load behaves like a pendulum, and any abrupt change in motion can set it swinging. A slow start helps limit the initial momentum, but stopping quickly creates a strong decelerating impulse that can drive the load to swing in the opposite direction. The safer, more effective approach is to move the load with smooth, gradual acceleration and then decelerate gradually to a stop, allowing the swing to decay rather than be amplified. That’s why slow start with a quick stop is not the best way to prevent swinging.