Changing the mass (Havoc)

I change the mass of an aggregate using :- aggregatename.body.setMassProperties({mass: 10}); but it doesn’t seem to have any effect.
Do I have to do something else as well ?

I have already realised this and have not done any further research. Maybe you have to adjust the speed of the mass according to the formula F=m*a with

let f = new BABYLON.Vector3(…);
mesh.physicsBody.setLinearVelocity( f.scaleInPlace(m) );
// mesh.physicsBody.setAngularVelocity( … );