Which activity does not produce the same results as the...

Which activity does not produce the same results as the other three?
a. sliding over a plastic-covered automobile seat
b. walking across a woolen carpet
c. scraping food from a metal bowl with a metal spoon
d. brushing dry hair with a plastic comb

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Key Concepts

Friction

Friction is the resistance to motion when two surfaces slide against each other. It not only converts kinetic energy into heat but can also lead to phenomena such as the generation of static electricity when there is relative movement between surfaces.

Static Electricity

Static electricity refers to the buildup of electric charge on the surface of objects, often as a result of friction. When materials are rubbed together, electrons can be transferred from one material to another, leading to an imbalance in electrical charge that can manifest as static cling or a spark when discharged.

Triboelectric Effect

The triboelectric effect is the process by which certain materials become electrically charged after coming into frictional contact with a different material. It explains why some material combinations tend to gain electrons while others lose them, resulting in a net static charge on the surfaces involved.

Material Properties and Conductivity

The ability of a material to accumulate or dissipate electrical charge depends on its composition and conductive properties. Materials like metals are good conductors and tend to transfer charge readily, reducing the buildup of static electricity, whereas insulators like plastic or wool are more likely to retain static charges.

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