Q:

What are some friction experiments?

A:

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.

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

  • Q:

    How do you find the coefficient of friction?

    A:

    To find the coefficient of friction between two surfaces, divide the maximum frictional force that can occur when one body is moving or has reached equilibrium and cannot move by the normal reaction force. The quotient represents the friction the two surfaces have with one another.

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  • Q:

    What does friction do?

    A:

    Friction is a force that tends to stop motion or resist the motion of objects. Friction is always a negative force, which means it acts in a direction opposite to the direction of the force applied to the object. Movement of objects through air and liquids gives rise to friction.

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  • Q:

    When is friction unwanted?

    A:

    Friction is unwanted in any situation in which free and continuous motion of mechanical parts is necessary. Some examples include the moving parts inside of an engine, door hinges and water slides.

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  • Q:

    How is friction unhelpful?

    A:

    Friction is a force that opposes motion, so it is unhelpful in all situations where the motion of an object is desired. A by-product of friction is that energy is wasted in the form of heat, which can cause problems in temperature-sensitive environments.

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