Question

3. Подумай, когда трение бывает полезным, а когда - помехой?​

Answer 1

Ответ:

Объяснение:

Трение бывает полезным когда она используется на благо человека:

за счет трения на бумаге остаются следы от карандаша и шариковой ручки.

Трение является помехой:

Когда из-за трения изнашиваются детали машины

Answer 2

Friction: When is it Useful and When is it a Hindrance?

Friction can be both useful and a hindrance depending on the context.

Useful Friction: - Mechanical Applications: In mechanical systems, friction is essential for the operation of various devices such as brakes, clutches, and gears. Friction allows these systems to function effectively by providing the necessary resistance for controlled movement and stopping. - Traction: Friction between tires and the road surface is crucial for providing traction, which is essential for vehicle control and safety.

Hindrance of Friction: - Energy Loss: In many cases, friction leads to energy loss in mechanical systems, which can be undesirable. For example, in the case of moving parts in machinery, excessive friction can lead to wear and tear, reducing efficiency and increasing maintenance requirements. - Obstruction in Motion: Friction can also hinder the smooth movement of objects, especially in cases where low friction is desired, such as in the case of bearings and sliding mechanisms.

In summary, while friction is essential for the operation of many mechanical systems and for providing traction, it can also lead to energy loss and hinder smooth movement in certain contexts.