Why does sandpaper have more friction

How can you reduce friction? There are a number of ways to reduce friction: Make the surfaces smoother. Lubrication is another way to make a surface smoother. Make the object more streamlined. Reduce the forces acting on the surfaces. Reduce the contact between the surfaces. Roll the bodies instead of sliding them.

Why does sandpaper have a lot of friction? Because everything has friction. The amount of it depends on applied force and smoothness of surfaces that touch. Sandpaper consists of millions, billions of particles which increases the effective area of the sandpaper. How many types of friction are there? Four Types. What are 2 causes of friction? Causes of Friction. Friction is a force that resists the relative motion between two objects or materials.

The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Static friction between two objects is usually larger than kinetic friction between the same two objects because two surfaces that stay together can really get stuck to each other, for example by bumps in one surface getting lodged in grooves in the other.

That's one reason why it's often so hard to get something like a screw or a jar lid unstuck, even though it's not hard to turn once it's loose. I found a really cool demonstration of this on. You'll need a motorized toy car of some sort. Take some blocks or a board and set them at an angle so that the car just barely keeps from sliding down it.

One example of this is when you wear cleats on a smooth hard surface you slip all over the place. Where as if you wore the same cleats on a soft surface the cleats would sink in and have a higher coeff of friction because the amount of area actually in contact with the ground is much higher.

The model of molecular cohension tried to explain this effect by describing friction as the cohesion of molecules between surfaces. The molecules of one substance would have to come close enough to the molecules of the other substance to interact. These contact points should produce some type of wear. This model was proven wrong when Jacob Israelachvili found clear evidence for a wear-free friction in the 's. The current model used to explain wear-free friction is based on the vibrations of atomic lattices.

The basic concept is friction occurs when atoms close to one surface are set in motion by the sliding action of atoms in the opposing surface. These vibrations are called phonons which are really sound waves which eventually get converted into heat.

The amount of mechanical energy the energy needed to keep the object moving converted to phonons depends on the nature of the sliding substance because different solids vibrate a certain specific frequencies. If one solid has many of the same frequecies as another then friction will be high. An excellent discussion of this can be found in Scientific American pg.

Another older but still informative article can be found in Scientific American pg. Roughness of surfaces is also a reason for friction. No matter how smooth a surface looks, it has some irregularities. Rolling friction is the weakest kind of friction. It is the force that resists the motion of an object rolling across a surface. The heavier the vehicle, the more friction is created between your tires and the road; this means you will need more engine power to push forward, and it will be easier to stop the vehicle on a level surface road.

Oil might feel thick to you, but to an engine, it is key in reducing friction at any speed, and reducing wear. Does sandpaper increase friction? Asked by: Green Hand. Does car brakes reduce friction? How friction can be increased? Why is friction a disadvantage? Does oil increase friction? Which has least friction? What type of friction has the most friction?

What surfaces have less friction? Does sand cause friction? Does Clay have more friction than sand? What is sliding friction example?

What are the 5 disadvantages of friction? Disadvantages of friction:. Friction produces a lot of heat in various parts of the machinery and this leads to wastage of energy as heat. What are 3 advantages of friction?