Question

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Answer 1

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TELEVISION

an electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound.

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Answer 2

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The two types of electric charges are: Positive and Negative,The friction force depends on two factors:

a) The materials that are in contact. The two materials and the nature of their surfaces. ...

b) The force pushing the two surfaces together. Pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other.