How is coefficient of friction determined

IndischerPhysiker IndischerPhysiker 1, 5 5 silver badges 17 17 bronze badges. Consider a very sticky surface, like acting as some kind of weak glue, and a block which has comparatively tiny mass.

There is no universal method I suppose, but one can start generalizing from there. Main ingredients a competing force with static friction over which you have control and can be gradually incremented as to find the breaking point will suffice.

So, I suppose there are two possiblities if the object still does not fall- 1. Either adhesion and friction are not the same things, or 2. Which one of these should be true? That's because in this case gravity will induce perpendicular to it normal force component. Check up, for example: Determining dynamic friction using a modified Kolsky method or Dynamic friction measurements at sliding velocities representative of high-speed machining processes and in the context of an industry in which I have actually worked and no, there was no standard method to speak of , Dynamic friction coefficient measurement of granular fertilizer particles And also patents: Dynamic friction coefficient measuring apparatus.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Featured on Meta. Now live: A fully responsive profile. Related Hot Network Questions. Question feed. At a constant velocity of M to the right, we may write:. The link below may be used for the coefficient of friction, although it says Newton's 2nd Law. In this experiment, since the coefficient of kinetic friction is to be measured, constant speed motion of block M requires a zero acceleration.

In this applet, a zero acceleration means no motion; therefore, try to keep the acceleration nearly zero, under 0. To cause motion, you need to slightly increase m , the hanging mass, by 0. Make sure that the acceleration remains under 0. You may need to practice for a while before doing the actual experiment. Calculate the friction force. To begin, first calculate Fnet, the net force on the block. The equation is. The applied force on the block, Fapplied, is the pull from the string cause by the weight of the hanging mass, m.

Now, calculate the friction force, f, the difference between the applied force and the net force. The equation is:. Graph the friction force, f, on the y-axis against the normal force, N, on the x-axis.

The slope will give you the kinetic friction coefficient. Place the object on the track at one end and slowly lift that end to make a ramp. At this angle, the effective force of gravity acting down the ramp is just barely greater than the friction force preventing the block from beginning to slide.