The high winds and strong rotations of a tornado create a powerful force that can pick up and propel objects of all sizes, including softer objects through harder objects. This is known as the "missile effect" of a tornado.
The softer objects may have a higher surface area to mass ratio, making them more susceptible to the force of the tornado. The strong winds can also cause the softer objects to become deformed, making them more aerodynamic and able to penetrate through harder objects.
Generally, objects that are smaller and lighter have a higher chance of being driven through other objects during a tornado. However, the exact objects that will be driven through others is unpredictable and can vary greatly depending on the strength and path of the tornado.
Currently, there is no known way to prevent the missile effect of a tornado. However, taking precautions such as securing loose objects and seeking shelter in a sturdy building can help reduce the potential damage caused by this phenomenon.
There have been reports of all types of objects being driven through others during tornadoes, including straws through trees, blades of grass through telephone poles, and even pieces of straw through steel and concrete walls.