How is friction produced?
Friction occurs when two solid or liquid objects come into contact through movement, this must be strong enough to overcome the resistance offered by the objects when rubbing.
- Friction on two types of surfaces
If the surfaces are uneven, the friction or rubbing will have more resistance to movement , it will be more difficult to move an object if the surface on which it must travel is rough.
The opposite happens if we need to move an object on a smooth surface. In this case the resistance to friction is minimal and the object will move very easily until the force of friction or friction stops it.
- Speed, weight and friction
The speed of the object will depend on the friction force and the mass of the object that we want to move. The heavier they are, the less speed they will have with the push and the friction force will be greater, because heavy objects have more friction.
The objects that are brushed undergo wear, in addition, the kinetic energy is transformed into heat and this is imperceptible, so the bodies that are rubbing produce heat and wear.
There are two types of friction: static and dynamic. Static friction is the one that is present before moving an object and keeps it subject, this force must be overcome so that there is movement or friction.
Dynamic friction is present in the displacement of objects and constantly opposes this while the object is moving. If the speed of the object is constant, the magnitude of the friction is also.
Dynamic friction is preceded by static friction. Hence there is a static friction (µͤ) and a dynamic friction (µͨ)
Examples of dynamic friction
If by dynamic friction it is understood that it is the permanent resistance force that exists between two moving bodies, the examples can be innumerable, since they occur in all objects that move in opposite directions.
- The friction force of the brakes of a moving car.
- Light a fire by rubbing sticks.
- Overcome the friction force when riding a bicycle
- Moving a baby’s car.
- Jogging to overcome the friction force of the wind.
- Boat trip.
- Ice skating
- The flight of an airplane
- The sliding of the hands between the hair
- Immerse yourself in the water.
- Brace to swim.
- Spin a rope.
- Throw a stone.
- The contact of the billiard balls and the lane.
- The propagation of the sound of the voice.
- The rotation of the earth
- Water circulation through pipes
- The movement of the waves of the sea
- The route of the river waters
- Drive a nail into wall, wood, etc.
- Jump, jump go.
- Wringing clothes while washing
- Chop food
- Using a saw to cut trees
- Sweep the leaves from the garden
- Paint a wall
- Brush the hair
- Bend and extend the legs and arms
- Push an object to different sides
- Horse racing, greyhounds, cars, etc.