Summary
- Friction is a force that opposes motion between any surfaces that are touching.
- Friction occurs because no surface is perfectly smooth.
- Rougher surfaces have more friction between them. ...
- Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
Does a rough surface have more friction than a smooth surface?
First of all a rough surface does not necessarily have greater friction than a smooth one. Think of a polished metal riding on a file versus just about anything on a very smooth “grip-it” silicon pad.
What is the relationship between friction and roughness?
Rough objects simply have more and/or more extreme irregularities in their surfaces, which increase the amount of tangential force experienced when you try to move against them. There are, of course, exceptions to this, because friction is the result of a variety of forces rather than just surface texture exclusively.
What are some interesting facts about friction?
An interesting fact about friction is that the amount of frictional force created by two objects in contact with each other is independent of the surface area of the objects. The amount of friction created is based on the how rough or smooth the objects are, not on the size of the objects.
What is the relationship between friction force and surface area?
Friction is a force that works in the opposing direction than an object is moving. The smoother the surfaces of the two objects in contact, the less friction. The rougher the surfaces of the two objects, the more friction....
Why does friction occur between smooth surfaces?
Now, coming back to your question, the friction between highly smooth surface comes because of adhesive forces. The original Amontons’ law is valid when there are impurities between the surfaces and the surface molecules “knows” that the impurities are not of his kind, but in case of highly smooth surface the surface fails to know which is which and “thinks”, it is one of its kind and hence clings to it with strong intermolecular force of attraction.
Why is smooth surface low friction?
Smooth surface has very low friction because in smooth surface there is less resistance to the movement!
What happens when two surfaces are not smooth?
Friction occurs between two surfaces when the surfaces are not smooth. On a molecular scale, materials have bumps and ridges, which get stuck on the bumps and ridges of the other material.
Why do two pieces of very smooth things have lots of friction sometimes less when wet?
two pieces of very smooth things have lots of friction sometimes less when wet since it is lubricates, but sometimes more because the ater traps air in the little pockets and creates a vacuum. Every get two plates stuck together?
What is friction in science?
Friction is a force that holds back the movement of a sliding object. That's it. Friction is just that simple. You will find friction everywhere that objects come into contact with each other. The force acts in the opposite direction to the way an object wants to slide.
When two surfaces that are smooth on a large scale touch each other, they touch at these asperity points?
When two surfaces that are smooth on a large scale touch each other, they touch at these asperity points. Friction originates at these points. So understanding asperity geometry and behavior is vital when studying materials in contact.
What to do when your fingers get caught in a rut?
Rough sand paper till have lots of holes you fingers get caught in and your skin needs to get out of those little ruts.
What are the effects of rougher surfaces on friction?
The question “What are the effects of rougher surfaces on friction?” has a simple answer if the weight and shape (round or flat) of the objects is constant—the rougher the surfaces, the more friction. If the weights and/or shapes of the objects differ, then mathematical equations come into play and the answer is not quite so simple, because the type of friction and additional types of force come into consideration.
What is friction in science?
Friction occurs when two objects come into contact with one another. Friction is a force that works in the opposing direction than an object is moving. The smoother the surfaces of the two objects in contact, the less friction. The rougher the surfaces of the two objects, the more friction.
Why does sand make a road rougher?
If sand or gravel is placed on icy roads, that makes the surface of the road rougher and therefore helps to create friction, allowing cars to stop more easily on an icy road. An interesting fact about friction is that the amount of frictional force created by two objects in contact with each other is independent of the surface area of the objects.
Why are mathematical equations not so simple?
If the weights and/or shapes of the objects differ, then mathematical equations come into play and the answer is not quite so simple, because the type of friction and additional types of force come into consideration.
Why does a car stop when it hits the brakes?
Think of a car on the road: when the driver of a moving car hits the brakes, the car’s slower-rolling tires against the ground create more friction and that friction helps the car stop. If the car is driving on water or ice, there is less friction, and thus it takes the car longer to stop, if the car does not start to slide.
Is a brick on the floor a frictional force?
This is not the case related to an object’s weight. If a one-pound brick is placed on the floor next to a three-pound brick, the frictional force of the three-pound brick is greater. That is because the weight or load of the brick on the floor is also a type of force.
Can two objects of the same size have the same amount of friction?
So two objects that are the same size could create the same amount of friction as two objects of different sizes, as long as the surfaces are the same in texture. This is not the case related to an object’s weight.
