# What is the coefficient of friction for sandpaper?

## What is the coefficient of friction for sandpaper?

Table 2 Surface roughness values of different textured surfaces

Serial number Grinding media Average friction coefficient
T10 3000 grit sandpaper 0.061
T11 5000 grit sandpaper 0.064
T12 Polished surface 0.073

What is the coefficient of friction for rubber?

Typical values for the coefficient of friction when sliding is occurring, i.e. the dynamic coefficient of friction are: for polished oiled metal surfaces, less than 0.1. for glass on glass, 0.4. for rubber on tarmac, close to 1.0.

What is the coefficient of friction for rubber on wood?

0.95

Material Combination Static Friction Coefficient
soft rubber on dry wood 0.95
hard rubber on dry wood 0.7
soft plastic on dry wood 0.7
hard plastic on dry wood 0.4

### What is the coefficient of friction between wood and sandpaper?

The highest was sandpaper which had a average coefficient of friction of 1.666. Next was foil, with an average coefficient of friction 1.665. After that, it was felt with a average coefficient of friction of 1.645. The last two were very close with wood at 1.636 and paper at 1.631.

Why does sandpaper have a high coefficient of friction?

It it is the area of all the microscopic contact points between the two objects. The more contact area the higher the friction. This explains your sisters results. As the sandpaper got to a certain roughness the grains of sand where larger which decreased the over all contact area and reduced the friction.

Why does rubber have a high coefficient of friction?

Current theories suggest that when rubber moves over smooth surfaces, it’s the molecular forces between the two that are the main cause of friction. But when the surface is rough, it’s the deformation of entire molecular layers of rubber that’s the chief cause of friction.

#### What is the coefficient of friction between rubber and asphalt?

Approximate Coefficients of Friction

Material Kinetic Static
Rubber on asphalt (dry) 0.72 0.68
Rubber on asphalt (wet) 0.53 -.–
Rubber on ice 0.15 0.15
Waxed ski on snow 0.05 0.14

What is the coefficient of friction between rubber and concrete?

Coefficients of Friction for Concrete

Material 1 Material 2 Kinetic
Rubber Concrete (dry) 0.6–0.85
Rubber Concrete (wet) 0.45–0.75

What is the coefficient of kinetic friction between wood and rubber?

0.5 0.3
where μk is the coefficient of kinetic friction. As seen in Table 1, the coefficients of kinetic friction are less than their static counterparts….MAGNITUDE OF KINETIC FRICTION.

System Static friction,μs Kinetic friction,μk
Rubber on dry concrete 1.0 0.7
Rubber on wet concrete 0.7 0.5
Wood on wood 0.5 0.3

## Does sandpaper reduce friction?

As the sandpaper got to a certain roughness the grains of sand where larger which decreased the over all contact area and reduced the friction. The grains are larger so there will be fewer contact points. One example of this is when you wear cleats on a smooth hard surface you slip all over the place.

How to derive coefficient of friction?

Concept of Stopping Distance.

• Friction.
• Stopping Distance Formula Derivation.
• Stopping Distance Formula Due to Friction
• Factors Affecting the Stopping Distance.
• Solved Example on Stopping Distance Formula.
• Summary.
• FAQs on the Stopping Distance Formula.
• What factors affect the coefficient of friction?

– μ is the coefficient of friction, – m is the mass, – g is gravitational acceleration, and – θ is the angle of the book.

### What is the formula for finding the coefficient of friction?

Walking or running: a person’s foot grips the ground and pushes against it to accelerate.

• Applying brakes to stop a car: brakes press against the moving wheels to create friction and slow them down.
• Lighting a match: rubbing the match head along the side of the matchbox creates friction which ignites the match.
• How do you measure the coefficient of friction?

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