Question

Почему при уколе острая иголка легче проникает, например, в кожу, чем тупая? ​

Answer 1

Ответ:

Чем меньше площадь опоры, тем давление больше

Объяснение:

Чем острее предмет тем большее давление он оказывает и протыкает легче

Answer 2

Ответ:

Объяснение:

Потому что площадь конца острой иголки меньше чем у тупой, следовательно давление больше и иголка легче проникает

Answer 3

Why is a sharp needle easier to penetrate the skin than a blunt one?

When it comes to the ease of penetration into the skin, a sharp needle is generally easier to penetrate than a blunt one. This is due to several factors:

1. Surface Area: A sharp needle has a smaller surface area compared to a blunt one. The smaller surface area concentrates the force applied to a smaller area, making it easier to break through the skin. In contrast, a blunt needle has a larger surface area, which distributes the force over a larger area, making it more difficult to penetrate the skin.

2. Force Concentration: The sharp tip of a needle concentrates the force at a single point, allowing it to exert more pressure on the skin. This increased pressure helps the needle to overcome the resistance of the skin and penetrate more easily. On the other hand, a blunt needle distributes the force over a larger area, resulting in less pressure being exerted at any given point, making it harder to penetrate the skin.

3. Reduced Friction: A sharp needle creates less friction as it moves through the skin. The sharp point allows the needle to cut through the skin with minimal resistance, reducing the frictional force that would otherwise impede its penetration. In contrast, a blunt needle encounters more friction as it pushes against the skin, making it harder to penetrate.

4. Tissue Displacement: A sharp needle displaces the tissue as it penetrates, creating a path for itself. This displacement helps to reduce the resistance encountered by the needle, making it easier to penetrate the skin. In contrast, a blunt needle may compress the tissue without displacing it, resulting in more resistance and making it harder to penetrate.

It's important to note that the ease of penetration also depends on other factors such as the thickness and elasticity of the skin, the angle of insertion, and the force applied. However, the factors mentioned above contribute to the general observation that a sharp needle is easier to penetrate the skin than a blunt one.