The bike can already be considered as a complex machine, probably because it is composed of different simple machines. The simple machines that can be found in a bike are the following: inclined planes and wedges, screws, the teeth that can be found on the chainrings, and so much more.
Even the pedals of the bike can be considered as a simple machine. The chain will act as a pulley ...
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Both are and were are linking verbs. Linking verbs as the connectors of the subject to the primary verb and additional information about the subject. If you want to say something that has already ended, you will say, "The cats were in the living room playing with their toys." This example means that the action of playing occurred in the past. The verb was used to differentiate the past and ...
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