Hey again, we're going to talk about the limit proportionality now. So we said before that force and extension are directly proportional up to a point. There is a force that can be applied to an object beyond which those two variables are no longer proportional. We call that the limit of proportionality. Now you may be expected to identify this from a graph of force and extension or to identify the the limit of proportionality numerically in terms of the amount of force, the maximum amount of force that can be applied whilst those two variables are still proportional. So here's a graph of force against extension. So you can see we have this line here and for the first part the two variables follow a linear relationship. This is a straight line and it'll be perfectly straight. I didn't use a ruler should have up to this point here. This is called the limit of proportionality and its definition is the maximum force that can be applied before extension is no longer directly proportional to force. After the limit proportionality then these two variables no longer have a they now have a nonlinear relationship. For each bit of each additional applied force beyond the limit of proportionality results in a greater and greater extension of the object. Now that's about everything I've got to say about that. Bye!