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# What are some friction experiments?

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UNSW describes an experiment meant to work out the coefficient of static and kinetic friction. The experiment is set up on a table top surface that’s made of vinyl. Two iron disc, each a mass of 1 kg, are placed such that the lowest seats on a sample of artificial turf. To measure the horizontal force needed to overcome friction, a spring balance attached to the masses is pulled.

## Keep Learning

An experiment to determine the friction between two sheets of paper is described by ABC. A simple set up involves pulling apart two sheets of paper to overcome the friction holding them together. Taking it a notch higher, two books of ordinary paper have their pages intertwined. While it’s easy to pull apart two sheets of paper, interleaved pages of two books are held together by more friction, and hence these are difficult to separate when pulled.

According to Vernier, one can experience static friction by trying to push a heavy box that rests on the floor. Pushing such a box lightly invokes an equal but opposite in direction static friction force. Applying more force to push the box increases magnitude of the friction. However, there is a limit to the friction force that can be produced between the floor and the box, as pushing harder eventually overcomes it and gets the box to move.

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## Related Questions

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The magnitude of frictional force is equal to the magnitude of the normal force multiplied by a frictional coefficient. The normal force is proportional to the force of gravity and is the ground pushing back up against an object. The frictional coefficient depends on the surface properties of the objects.

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Some force and motion experiments include dropping two objects of different masses from the same height to demonstrate Newton’s law of acceleration, and the terminal velocity experiment to demonstrate the interaction of the effect of drag or resistance on acceleration. Two objects with different masses dropped from the same height reach the ground at the same time.

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Some experiments that test the viscosity of liquids are the marble race experiment and the liquid race experiment. For the marble race experiment, you need a tall graduated cylinder, a marble, a stopwatch and the various liquids to test. For the liquid race experiment, you need a ramp, the liquids to test, and a stopwatch or tape measure.