Pregunta 1
Pregunta
Machines are objects that we use to save time and energy.
Pregunta 2
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There are two kinds of machines by their complexity: simples or complex.
Pregunta 3
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The machines never use a person´s energy.
Pregunta 4
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The machines can use wind or water energy.
Pregunta 5
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Many machines use electricity or electrical current.
Pregunta 6
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The most of cars need combustible fuel to work. It's the energy for them.
Pregunta 7
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Wheels, pulley are complex machines.
Pregunta 8
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Mechanical machines are used to lift light objects but we don't use that to produce movement.
Pregunta 9
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Machines make the work harder for workers.
Pregunta 10
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We can find two kinds of mechanical machines: Manual and Automatic.
Pregunta 11
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Machines make our life easier in the communication.
Pregunta 12
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The structure of a machine is the skeleton of the machine.
Pregunta 13
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The housing doesn't protect the machine.
Pregunta 14
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Automatic machines that produce movement have a motor engine.
Pregunta 15
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Electrical circuits and electronic circuits direct the energy to the motor and other parts.
Pregunta 16
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Sensors don't enable the machine to receive information from the outside or inside of the machine.
Pregunta 17
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An antenna isn't a sensor.
Pregunta 18
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Indicators and screen give us information about how the machine is functioning.
Pregunta 19
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Operating parts are the moving pieces os a mechanical machine.
Pregunta 20
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Wheels and axles aren't an operating parts.
Pregunta 21
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Gears don't need teeth or cogs to transmit movement.
Pregunta 22
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Machines can do the work of more than one person at once.
Pregunta 23
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Modern transportation allows us to travel far away.
Pregunta 24
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The combustible fossil in different types of transportation is perfect for the environment.
Pregunta 25
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Machines haven't done advances in health.