# What is mK in friction?

## What is mK in friction?

The magnitude fK of the of the kinetic frictional force is given by fK = mK FN mK: coefficient of kinetic friction mK < ms.

## Is friction always mu N?

coefficient of friction, ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together. It is usually symbolized by the Greek letter mu (μ). Mathematically, μ = F/N, where F is the frictional force and N is the normal force.

**What is the relation between MS and mK?**

What is the difference between MS and MK in the part number nomenclature? All the products listed above have product number starting with the string ‘MS’ originally meaning ‘Metrologic Scanner’. Sometimes the same products are also referred as ‘MK’ originally meaning ‘Metrologic Kit’.

**What is coefficient of friction k?**

The kinetic friction coefficient μk is the ratio of the friction force to the normal force experienced by a body moving on a dry, non-smooth surface.

### Can the coefficient of kinetic friction be greater than the coefficient of static friction?

With the simple model of friction, using coefficients of static and kinetic friction, you are right – the coefficient of kinetic friction cannot be higher than the coefficient of static friction.

### Is the coefficient of friction always less than 1?

The coefficient of friction depends on the objects that are causing friction. The value is usually between 0 and 1 but can be greater than 1.

**What unit is coefficient of friction?**

no units

The coefficient of friction is the ratio of a force to a force, and hence has no units.

**What is correct relation between ΜK and μs?**

Therefore µs is generally greater than µk. Graphically, this is shown in Figure 1: As you increase the force, the static friction force increases linearly until the applied force F equals µsFN . After this point the object “breaks away” and the friction force falls to the kinetic friction value.

## Why is coefficient of friction always less than 1?

Because the coefficient is the ratio of friction force to normal force and friction force would rarely exceed normal so ratio must be between 0 and 1.

## Can the coefficient of kinetic and static friction be equal?

With the simple model of friction, using coefficients of static and kinetic friction, you are right – the coefficient of kinetic friction cannot be higher than the coefficient of static friction. In real world, the phenomenon of friction may be much more complex.

**Can coefficient of friction be above 1?**

The coefficient of friction can never be more than 1.

**Can coefficient of friction be greater than 1 explain?**

Yes. When the contact surface is heavily polished then frictional force increases due to the increase in the adhesive forces between the molecules. In such case co-effiecient of friction will be greater than one.

### How do you find friction coefficient?

The formula to calculate the coefficient of friction is μ = f÷N. The friction force, f, always acts in the opposite direction of the intended or actual motion, but only parallel to the surface.

### Why is ΜK smaller than μs?

The force necessary to induce motion (i.e. to overcome the static friction), is bigger than the one necessary to continue the motion (i.e. to overcome kinetic friction). So the coefficient of kinetic friction (μk) is lower than the one of static friction (μs).

**Why must the coefficient of static friction always be greater than or equal to the coefficient of kinetic friction?**

Static friction is greater than kinetic friction because there are more forces at work keeping an object stationary than there are forces working to resist an object once it is in motion.

**Is friction coefficient always less than 1?**

The coefficient of friction is dimensionless and it does not have any unit. It is a scalar, meaning the direction of the force does not affect the physical quantity. The coefficient of friction depends on the objects that are causing friction. The value is usually between 0 and 1 but can be greater than 1.