Physical meaning of a Metre-Second? [or (Kg · s) or (N · s) ]

[CF.Gauss]

We all understand what metres PER second (m/s) physically means... but,
What I was wondering was what does a 'metre-second' actually mean? Or does it have a physical meaning at all!

As an example:

If we take the units for Dynamic viscosity we have:

Kilogram per metre second ( Kg / m.s )

On a side note, in relation to my above example:
The SI physical unit of dynamic viscosity is the pascal-second (Pa·s), which is identical to
Kg. m^-1.s^-1 = Kg / (m s)


Another example, of a similar type, would be the standard unit of momentum, which is:
Kilogram-metre per second (kg · m/s or kg · m · s^-1 ) which in SI units is equal to Newton-second (N · s)

In this example we have both a Kilogram-metre and, in SI, a Newton-second!
I can easily conceptualise the idea of, say, 1 Metre every 1 Second (m/s) but I am finding it hard to conceptualise this concept!

How exactly could one have, in the physical world, a metre-second (m · s), kilogram-metre (Kg · m) or Newton-second (N · s)?

 

[jbriggs444]

If you could snort a white powdery substance from the surface of a mirrored conveyer belt moving at a fixed speed using a stationary rolled up piece of currency with a diameter measured in meters and had a certain number of seconds to do so, the "meter second" could be used as a relevant measure.

 

[rock.freak667]

If you could snort a white powdery substance from the surface of a mirrored conveyer belt moving at a fixed speed using a stationary rolled up piece of currency with a diameter measured in meters and had a certain number of seconds to do so, the "meter second" could be used as a relevant measure.

:rofl: :rofl:

We all understand what metres PER second (m/s) physically means... but,
What I was wondering was what does a 'metre-second' actually mean? Or does it have a physical meaning at all!

As an example:

If we take the units for Dynamic viscosity we have:

Kilogram per metre second ( Kg / m.s )

On a side note, in relation to my above example:
The SI physical unit of dynamic viscosity is the pascal-second (Pa·s), which is identical to
Kg. m^-1.s^-1 = Kg / (m s)


Another example, of a similar type, would be the standard unit of momentum, which is:
Kilogram-metre per second (kg · m/s or kg · m · s^-1 ) which in SI units is equal to Newton-second (N · s)

In this example we have both a Kilogram-metre and, in SI, a Newton-second!
I can easily conceptualise the idea of, say, 1 Metre every 1 Second (m/s) but I am finding it hard to conceptualise this concept!

How exactly could one have, in the physical world, a metre-second (m · s), kilogram-metre (Kg · m) or Newton-second (N · s)?

Never used metre-second but for something like the N*s, it would be the force acting over a period of time such that the Impulse = Force*time

For something like kg-m, this could be something like a mass acting a distance. For example, if you have a shaft with an unbalance in it (center of rotation does not coincide to where the mass acts), you quantify the unbalance as a mass-eccentricity.

Mass eccentricity me = mass*distance, usually given in gram-cm or some unit like that.

 

[CF.Gauss]

Never used metre-second but for something like the N*s, it would be the force acting over a period of time such that the Impulse = Force*time

would the force acting over a period of time not be Newtons per second ( N/s )?

 

[rock.freak667]

would the force acting over a period of time not be Newtons per second ( N/s )?

That would give you the rate of change of force. A typical Force-time graph looks like this:

The area under the graph gives the impulse which is the same as the change in momentum.

 

[lightarrow]

If you could snort a white powdery substance from the surface of a mirrored conveyer belt moving at a fixed speed using a stationary rolled up piece of currency with a diameter measured in meters and had a certain number of seconds to do so, the "meter second" could be used as a relevant measure.

Very good!
I thought of a tunnel's price (tunnel length multiplied time of realization) but you beat me...