What are some examples of increasing or decreasing friction in life?

Examples of increasing friction in life:

1, the soles and tires are engraved with concave and convex patterns. In order to increase friction and prevent slipping.

Gymnasts or weightlifters should put magnesium carbonate powder on their hands before the competition.

3. Install snow chains on vehicles driving on ice and snow roads.

4. The rough surface of ceramic tile uses friction to prevent slipping.

5. Braking uses friction.

Examples of reducing friction in life:

1, roller skates slide on the ice. ?

2. The mechanical watch has been worn for a long time, so it should be oiled to reduce friction.

3, maglev train, reduce friction.

4. The rotating shaft of the fan should be smooth to reduce friction.

5. Install rolling bearings on the rotating parts of the machine and add lubricating oil to reduce friction.

Extended data:

The force that hinders the relative motion (or relative motion trend) of an object is called friction. The direction of friction is opposite to the direction of relative motion (or relative motion trend) of objects.

Friction is divided into static friction, rolling friction and sliding friction.

When an object slides on the surface of another object, there is friction between the contact surfaces that hinders their relative movement. This friction is called sliding friction. Sliding friction is related to the roughness and pressure of the contact surface. The greater the pressure, the rougher the contact surface of the object and the greater the sliding friction.

The methods to increase the favorable friction are: increasing the pressure, increasing the roughness of the contact surface, the size of the pressure and so on. The methods to reduce harmful friction are: ① reducing pressure; ② Smooth the contact surface between the object and the contact surface; (3) separating the object from the contact surface; ④ Change from sliding to rolling.

References:

Friction-Baidu Encyclopedia