Friction is force resisting relative motion of solid surfaced, fluid layers and material elements sliding against each other. Examples of friction are rubbing your hands together, rubbing two pieces of wood together, automobile brakes, rain adhesion, road slipperiness, split friction, road texture, lighting matchsticks and rolling a coin.
Using lubricants such as oil or grease to reduce friction between surfaces. Using ball bearings or roller bearings to minimize friction in rotating components. Polishing or smoothing the surfaces in contact to reduce roughness and friction. Maintaining proper alignment and spacing between moving parts to decrease friction. Applying a low-friction coating, such as Teflon, to surfaces to reduce friction.
Friction is actually a super useful force that we need everywhere. Here are just a few examples. First of all, you want friction when trying to move any distance. Whether it's walking (friction of feet to ground), driving (tires and ground) or even swimming/flying, friction is just vital. On the flip side, you definitely want friction while you are already moving. Every braking system relies on friction to work. If you are in a moving car, you hope that there is friction between the brake pads and brake disks. There are also less obvious benefits of friction. Friction can be used as a helpful force. For example, lifting a box 5 meters and pushing it up a frictionless ramp to a height of 5 meters would require the same amount of work. Yet in real life, it's easier to push things up ramps. Although the ramp itself has friction, there is usually a greater force of friction between your feet and the ground which actually reduces the amount of work you have to enact onto the box yourself. This concept is useful in many different ways. If you just look around for man-made inventions, you will find hundreds of other examples. So many different things, ranging from pencils to CPU fans benefit from some form of friction in one way or another
To increase friction, you can roughen the surfaces in contact or increase the force pressing the surfaces together. To decrease friction, you can make the surfaces smoother or reduce the force pressing the surfaces together.
1. Our cars would get much better gas mileage without tire and air friction. 2. There would be no more skinned knees if friction didn't exist. (Like when you are skating or playing football.) 3. We wouldn't have to worry about clothes chaffing us in dry weather if there were no friction. 4. We could do some pretty amazing dance moves without friction. (The Electric Slide would last forever....) 5. Our shoes would last a lot longer without friction.
Three types of friction are : 1. Kinetic friction :Friction that arises between surfaces in relative motion. 2. Static friction :Friction that acts between surfaces at rest with respect to each other 3. Rolling friction : Friction that occurs when an object rolls over a surface. Static, sliding, rolling.
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