Human biomechanics basic concepts part-1-kinetics and clinical applications, internal force, stress

hello friends in the previous videos we have discussed mechanics in relation to rigid bodies like blocks and wedges now you might wonder how these principles are applicable on human body as an example 20 newton force is required to push a box of 40 kg from point a to point b however when the same weight human is

pushed with the same amount of force he might not move at all so why does this happen stay tuned to understand basic kinetic principles at the end of this video are some easy techniques to help you remember these principles for your exam a cheat sheet before we start make sure to subscribe and press the bell icon so you don't

miss any new content with that let's begin learning remember that force is a push or a pull as in the picture see one boy is pulling the block another is pushing all forces have a magnitude that's the amount and a direction in this case both these guys are pulling in one direction force can be internal or they can be

external internal forces in this case are applied by the boy who's pulling the block whereas external force is friction between block and ground we're going to learn the following principles in today's video tension compression shear bending and torsion let's look at tension first in simple words tension is generated in an object when it is pulled apart from

two sides like this bar pulled from either side or the tension on rope and tug of war the human body scenario is different though tension is placed on humerus or arm bone when you're hanging on a bar here the arm bone is pulled from its ends as it attaches to scapula on one

end and forearm bones on the other the tension stress develops longitudinally in the bone on other hand if there is high tension load ligaments or tendons may sprain or rupture muscles might be torn or bones can be fractured compression compression forces are the ones wherein force is applied at both ends of an