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kodGreya [7K]
3 years ago
5

Compare positive and negative feedback mechanisms.

Physics
2 answers:
svlad2 [7]3 years ago
7 0

Positive feedback mechanisms is the types of feedback loop in which a change in a particular direction causes additional change in same direction. it is also called positive feedback loops or positive feedback systems.

Negative feedback mechanism tends to bring conditions within the body back to it's normal state. it is also called negative feedback loops or negative feedback systems.

<h2>Further Explanation</h2>

Positive feedback mechanisms are mostly used for variables that have the ability to amplify itself. Positive feedback can be very harmful in most cases, and can also contribute to normal function when used in limited fashion.  

An example of positive feedback occurs in lactation, in which a nursing mother produces breast milk for her infant. During pregnancy, the levels of the hormone (Prolactin) that stimulates milk production increases, but progesterone prevents milk production.

However, the progesterone levels will drop soon as a baby is born and the placenta is released from the uterus and this will cause the breast milk to flow. As the baby sucks the breast, the breast is also stimulated.

This stimulation causes further release of prolactin and more milk is produced. This positive feedback makes it possible for the baby to have enough milk during feeding.

Negative feedback mechanisms is a type of feedback loop in which a change in a direction causes changes in opposite direction.

For example, negative feedback loop that involves glucagon and insulin can help maintain a normal glucose level.

If the glucose is very high, the body discharges insulin into the bloodstream and if low, the body releases glucagon. The glucagon causes the release of glucose from the body cell.

LEARN MORE:

  • positive and negative feedback brainly.com/question/12299473

KEYWORDS:

  • positive feedback mechanisms
  • negative feedback mechanisms
  • hormones
  • glucose
  • feedback loops
NeX [460]3 years ago
6 0

Answer:

In positive feedback mechanism, the output is fed back to the system which further increases the output. Hence, it is known as positive feedback because it amplifies the output.

In the negative feedback mechanism, the output is fed back to the system which further decreases the the output. Hence, it is known as negative feedback because it reduces the output.

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Answer:

Energy is transformed from potential to kinetic and vice versa

Explanation:

The energy is transformed from mechanical to kinetic energy when the object changes its position with respect to a reference point, where it loses height but increases its speed. When the object is at maximum height with respect to a reference point, it will have its maximum potential energy value. When the object passes through the reference point it will have potential energy equal to zero, but this energy will become kinetic energy.

The most characteristic and real example is that of a pendulum at one end, as can be seen in the attached image.

When the pendulum is located at the top end, as shown in Figure 1, at that point the maximum potential energy will be held. Then the pendulum is released and when it passes through the reference point and its height is zero, with respect to that point, all potential energy will have become kinetic energy in the same way at this point the maximum speed of the pendulum will be set.

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3 years ago
The glowing of a neon light is caused by electrons emitting energy as they
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Move from higher to lower energy levels
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A 50g man is walking at a speed of 4m/s. what is the kinetic energy of the walker?
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We have: K.E. = 1/2 mv²
Here: m = 50 g = 0.05 Kg
v = 4 m/s

Substitute their values, 
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In short, Your Answer would be 0.4 Joules

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Noah drops a rock with a density of 1.73 g/cm3 into a pond. Will the rock float or sink?
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Explanation:

Substances with their density less than that of water which is 1 g/cm³ will float on it whiles those greater than that of water will sink into the water

From the question the density of the object is greater than that of water so the object will sink into the water

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mrs_skeptik [129]

Answer: He would reach 7m/s at the distance of 17,5m.

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7 = 0 + 1.4t

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Now, we want to know the distance this boy reaches in 5 seconds, in a 7m/s speed and accelarating in 1.4m/s². For finding this out, we use another equation, S = So + Vot + (at²)/2, S being the final distance, So = 0m because he started from rest, and the other variables used before.

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S = 35/2

S = 17,5m

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3 years ago
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