ME03 – Momentum is variable….. you change the mass and/or you change the velocity.

ME03 – Momentum is variable….. you change the mass and/or you change the velocity
 

Summary….. Here is a help file to get a grip of these points:

It boils down to a simple equation with just 2 variables to play around with….. (m and v).
* Momentum (p)… is mass (m) [the vehicle and all in it]….. multiplied by….. velocity (v) [the speed in a direction].
therefore:
* p = mass (m) x velocity (v)
therefore:
* p = m.v

* The 'm' bit on our roads…
'm' (mass)….. vehicles on the same road, are a mix of different masses, even if all traveling at the same speed…..
this (mass) is relevant….. if momentum is transfered in a collision.
this (mass) is relevant….. if it helps create an unreasonable perspective of bravado or fear in road users attitudes.

* The 'v' bit on our roads…
'v' (velocity)….. vehicles on the same road, can have a mix of different velocities, even ones of identicle masses…
this (velocity) is relevant….. as each driver is responsible for the vehicle's velocity at any and all times.
this (velocity) is relevant….. as each driver has a duty for safe spacing.
this (velocity) is relevant….. as each driver has a duty for safe speed and direction adjusting

mass, speed and direction….. all are relevant to safe roads.

It boils down to a simple equation with just 2 variables to play around with….. (m and v).
* Momentum (p)… is mass (m) [the vehicle and all in it]….. multiplied by….. velocity (v) [the speed in a direction].
therefore:
* p = mass (m) x velocity (v)
therefore:
* p = m.v

simplified….. to get the gist of how an equation works and how to play around with the variables:
* With all equations you find the missing numbers (values)
Lets use easy pretend values:
m = 2
v = 3
To find p, (p = mv)….. we can see that it needs m multiplied by v
so p = 2 x 3
so p = 6

If a car has a mass of 2…. then a lorry has more mass, so we''ll say 4….. now do the equation again:
m = 4
v = 3
To find p, (p = mv)….. we can see that it needs m multiplied by v
so p = 4 x 3
so p = 12

In both above examples, the ' v ' value was kept the same and the ' m ' was varied….. the totals show that a bigger value  ' m ' equals a bigger value ' p '
This same thing is occurring on our roads…. a car and lorry driving at the same speed and direction ( same ' v ' ) will have a different mass ( 'm ' value )…. usually the car has a smaller mass than the lorry…. so now it can be known, that, at the same speed and direction:
* the car will have less momentum than the lorry
* the lorry will have more momentum than the car

Still here?? Lost?? HaHa it's not that important….. but the thing to get the gist of….. is this:
* Change the value of either m or v….. and it effects (higher and lower)….. the value of p
* Change the value of mass or velocity…. and it changes the value of momentum (in moving vehicles on our roads)

* The 'm' bit on our roads…
'm' (mass)….. vehicles on the same road, are a mix of different masses, even if all traveling at the same speed…..
this (mass) is relevant….. if momentum is transfered in a collision.
this (mass) is relevant….. if it helps create an unreasonable perspective of bravado or fear in road users attitudes.

If a driver 'dials it up' (it = momentum), then 'dials it down' (it = momentum), so the vehicle moves then stops…. safely…. then a safe drive will have been achieved.
If any collision situation occurrs…. then, for the same velocity, a larger massed vehicle will transfer a larger quantity of momentum to the other vehicle involved…., and the collision will create a larger place of possible hurt and badness.

There is slso an issue to consider, regarding the notion that a larger massed vehicle, is more substantial…. and perhaps affords the occupants of a larger massed vehicle, a greater element of safety, if involved in a collision.
– This same notion, could create an unreasonable perspective of bravado, from an arrogant driver of a large massed vehicle.
– This same notion, could create an unreasonable perspective of worry, from occupants of a smaller massed vehicle.

* The 'v' bit on our roads…
'v' (velocity)….. vehicles on the same road, can have a mix of different velocities, even ones of identicle masses…
this (velocity) is relevant….. as each driver is responsible for the vehicle's velocity at any and all times.
this (velocity) is relevant….. as each driver has a duty for safe spacing.
this (velocity) is relevant….. as each driver has a duty for safe speed and direction adjusting.

Velocity is speed…. AND direction…. which is just as relevant.
If two vehicles are travelling at the same speed of 30 mph:
– If their direction is the same…. there is no chance of then colliding
– If their direction is opposite (and travelling away from each other)…. there is no chance of colliding
– If their direction is opposite (and travelling towards each other)…. there will be a collision…. at a speed of 60 mph

Direction is important…. The driver has a steering wheel…. the driver has gripping tyres…. the driver has an awareness of surface conditions and skid potential (ideally).
Both speed and direction are key to a drivers, creating safe distances between each other as well as other road users and obstacles.
What ever the direction of travel of a vehicle…. the driver is responsible for it.
Each driver has a duty for safe speed AND direction adjusting.

mass, speed and direction….. all are relevant to safe roads.

ME03 Summary:

It boils down to a simple equation with just 2 variables to play around with….. (m and v).
* Momentum (p)… is mass (m) [the vehicle and all in it]….. multiplied by….. velocity (v) [the speed in a direction].
therefore:
* p = mass (m) x velocity (v)
therefore:
* p = m.v

* The 'm' bit on our roads…
'm' (mass)….. vehicles on the same road, are a mix of different masses, even if all traveling at the same speed…..
this (mass) is relevant….. if momentum is transfered in a collision.
this (mass) is relevant….. if it helps create an unreasonable perspective of bravado or fear in road users attitudes.

* The 'v' bit on our roads…
'v' (velocity)….. vehicles on the same road, can have a mix of different velocities, even ones of identicle masses…
this (velocity) is relevant….. as each driver is responsible for the vehicle's velocity at any and all times.
this (velocity) is relevant….. as each driver has a duty for safe spacing.
this (velocity) is relevant….. as each driver has a duty for safe speed and direction adjusting

mass, speed and direction….. all are relevant to safe roads.

Previous part is:
ME02 – Momentum is gained & lost…. you ‘dial it up’ and you ‘dial it down’
Preceeded by:
ME01 – Momentum is a quantity….. you have ‘none’ or you have ‘some’

* MOMENTUM is relevant for road safety.
* An awareness of momentum = an awareness of, mass, speed and direction…. all are relevant.
* An awareness of momentum = awareness to creating safer roads.

 
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