What Causes the 40 Ton Recoil in a 120mm Mortar?

[Ashkan]

when it is said that the recoil of a 120mm mortar is 40 tons, which one is meant to be the recoil: the reaction force exerted from gases on the recoil mass, OR the transmitted force from recoil system to the platform or vehicle (if it is mounted on a vehicle)?

Thanks...

 

[Dickfore]

Both, depending on context. Also, a ton is not an SI unit of force.

 

[tkshoe]

Both, depending on context. Also, a ton is not an SI unit of force.

two words: conversion factors. :P

 

[Dickfore]

two words: conversion factors. :P

two and a half words: variation of g.

 

[tkshoe]

two and a half words: variation of g.

one word: negligible :)

 

[Dickfore]

one word: negligible :)

How about on an inclined plane at \alpha = 60^{\circ}?

 

[tkshoe]

How about on an inclined plane at \alpha = 60^{\circ}?

Ok... I thought you were referring to g as gravity, and therefore variation in g would be negligible since this is not a super duper mortar. But now that you have mentioned an angle... I have no idea what you are talking about. Mind clarifying what you were referring to as "g"?

Regardless, a ton is 2000 lbs and lbs easily convert to Newtons which I assume are your desired "SI" units. Hence my, albeit somewhat snide, comment about conversion factors.

 

[Dickfore]

What is a pound a unit of?

 

[Ranger Mike]

recoil is 80,000 pounds force exerted on the mortar's base plate...

 

[tkshoe]

What is a pound a unit of?

pound is a unit of force as are tons as are Newtons with Newtons being the SI unit of force. I am done now, this is going nowhere.

 

[Dickfore]

pound is a unit of force as are tons as are Newtons with Newtons being the SI unit of force. I am done now, this is going nowhere.

Why is the amount of groceries measured in units of force?

 

[emiltr]

1000Kg = 1 tonne. Is a unit of mass, not force. (1pound=0.45kg)

http://en.wikipedia.org/wiki/Kilogram"

For force: 1Kgf = 1g N = 9.81 N (10N). g = gravitational acceleration (constant)

http://en.wikipedia.org/wiki/Newton_(unit)"

From momentum conservation law.
m₁V₁=m₂V₂
m₁,V₁-projectile mass and speed; m₂,V₂- mortar mass and speed
And can calculate the force that generated the movement.
40tf (40.000 Kgf) = 400KN (400,000 N)