CUÁNTAS MÁS ACIERTES MÁS GANAS

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Tines que leer la pregunta que te pone y elegir la opción correcta

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EDURNE ANDÚGAR BAÑO

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CUÁNTAS MÁS ACIERTES MÁS GANAS


CUÁNTAS MÁS ACIERTES MÁS GANASVersión en línea Tines que leer la pregunta que te pone y elegir la opción correcta por EDURNE ANDÚGAR BAÑO 1 What is the main function of the mechanisms? a Transmit and/or transform forces and movements from a driving element to a driven one to facilitate human work. b Transform only electrical energy into thermal energy, without intervening in the movement. c Serve only as decorative elements on machines without any practical function. d Generate energy by themselves without the need for any motor or external source. 2 When is a lever in balance? a When the product of the force times your arm is equal to the product of the resistance times your arm. b When the applied force is always greater than the resistance, regardless of the distances to the support point. c When the resistance is zero and the force acts at any point on the bar. d When the support point is exactly in the center of the bar, regardless of the forces. 3 Which of these statements correctly describes a fixed pulley? a It does not provide mechanical advantage, but it changes the direction of the force making work easier. b Reduces the necessary effort by half, allowing loads to be lifted with less force. c Multiplies the speed of movement without modifying the force applied. d It is only used in complex systems such as car engines. 4 In a pulley and belt system, what happens if the driven pulley is larger than the driving pulley? a A speed reducing system is obtained, since the output pulley rotates more slowly. b There is an increase in speed at the output, since the large pulley rotates faster. c Nothing changes, both pulleys always rotate at the same speed regardless of size. d The system stops working because the strap cannot adapt to different sizes. 5 What is the main difference between chain and sprockets and pulleys and belt? a The chain cannot slip on the teeth of the sprockets, which ensures a more precise transmission. b The chain can slip on the sprockets, while the belt cannot slip on the pulleys. c Both systems work exactly the same, without any practical difference. d Pulleys and belts are only used in bicycles, while the chain is used in industrial machines. 6 What happens to the direction of rotation in a gear system? a The gears rotate in opposite directions due to the direct contact of their teeth. b Both gears always rotate in the same direction. c The direction of rotation depends only on the size of the gears. d Gears do not transmit motion, only force. 7 Which of these mechanisms transforms circular motion into linear motion? a Rack and pinion. b Simple gears. c Pulleys with belt. d Chain and sprockets. 8 What characterizes a circular-alternating transformation mechanism? a Transform the circular movement into a back-and-forth (alternating) movement. b Converts circular motion into continuous turning motion without changes. c It only transmits forces without modifying the type of movement. d It works only with electrical energy. 9 In a hoist, what happens when we increase the number of moving pulleys? a The effort required decreases, but the load moves less distance when pulling the rope. b The effort required increases, but the displacement of the load also increases. c Nothing changes, since the number of pulleys does not influence the operation. d Only the speed changes, but not the force or displacement. 10 In a gear system with an intermediate wheel, what function does the wheel serve? a Change the direction of rotation without modifying the transmission ratio. b Reduce the force transmitted to avoid damage to the system. c Increase the rotation speed without affecting the direction of movement. d Reduce the number of teeth on the main gears.

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CUÁNTAS MÁS ACIERTES MÁS GANASVersión en línea

por EDURNE ANDÚGAR BAÑO

What is the main function of the mechanisms?

When is a lever in balance?

Which of these statements correctly describes a fixed pulley?

In a pulley and belt system, what happens if the driven pulley is larger than the driving pulley?

What is the main difference between chain and sprockets and pulleys and belt?

What happens to the direction of rotation in a gear system?

Which of these mechanisms transforms circular motion into linear motion?

What characterizes a circular-alternating transformation mechanism?

In a hoist, what happens when we increase the number of moving pulleys?

In a gear system with an intermediate wheel, what function does the wheel serve?