Everyday Life & Technology
How does a crane keep its balance?
A crane lifts a heavy load. Puschel discovers why the other side matters too.
The short answer
A load on a long crane arm pulls the crane to one side. A counterweight and a stable base help balance it. The load's distance from the pivot matters too.
An imagined Wusel scene
Puschel and Flauschi investigate
At a small table model, Puschel places the same light load first close to the pivot and then farther out. Farther out, the model tips more easily. Flauschi steadies it while they compare the distances.
Puschel marks both positions: equal weight can have a different tipping effect.
Try explaining it
The same load hangs farther out. What can increase?
Choose a), b) or c), then explain your choice.
- a)The strength of gravity at the same place.
- b)Its tipping effect.
- c)The mass of the unchanged load.
Show the explanation
Correct: b): Its tipping effect.
A load on a long crane arm pulls the crane to one side. A counterweight and a stable base help balance it. The load's distance from the pivot matters too.
Word help
- mass
- A property of objects, measured in grams or kilograms, that affects gravity and resistance to changes of motion.
Explore in more detail
Here you will find longer explanations and further details. You can explore them together.
Understand step by step
How it works – simply explained
A load can tip it
A load on a long jib produces a turning effect. Further from the support means more turning effect for the same weight.
Counterweight and base help
Counterweights act on the other side. A suitable base and supports transfer forces to the ground. Counterweight alone cannot explain every safe position.
Limits are calculated
Excessive or distant loads can be dangerous. Specialists set permitted loads and positions. A small picture explains an idea, not an approved crane design.
Why the same load is harder further out
A crane may safely hold a load near its tower but not the same load further out. Distance increases its turning effect. Professionals check position as well as mass. The imagined model explains balance, not a safe construction plan or an allowed load for a real crane.
References for this explanation: [1]