How hard do you have to hit something break a bone?

The amount of force required to break a bone depends on several factors, including the bone's strength, the point of impact, and the angle of the strike. Generally, more force is needed to break a larger or denser bone than a smaller or less dense one. The force required also increases if the impact is indirect or if the bone is struck at a vulnerable angle. For example, a direct hit to the shinbone (tibia) with a heavy object is more likely to cause a fracture than a glancing blow to the arm. Additionally, bones can be weakened by certain medical conditions, such as osteoporosis, which can increase the risk of fracture even with relatively low-force impacts.