Yes but I already changed the mass but it seems to do nothing. The velocity of the box is not modified. The mass only seems to change the force applied against other rigid bodies (joints...).
With a mass=1
phy start
autocam off
sync on
sync rate 60
color backdrop 0
make object box 1, 40, 1, 40
phy make rigid body static box 1
color object 1, rgb ( 10, 10, 10 )
phy make material 1, "static friction"
phy set material static friction 1, 1
phy set material restitution 1,0
phy build material 1
make object cube 2, 2.5
position object 2, 0, 30, 0
phy make rigid body dynamic box 2
phy set rigid body mass 2,1
color object 2, rgb ( 0, 0, 255 )
position camera 0, 5, -40
do
If MouseClick()=1 then phy set rigid body linear velocity 2,0,5,0
sync
phy update
loop
With a mass=100000 (the box goes through the floor)
phy start
autocam off
sync on
sync rate 60
color backdrop 0
make object box 1, 40, 1, 40
phy make rigid body static box 1
color object 1, rgb ( 10, 10, 10 )
phy make material 1, "static friction"
phy set material static friction 1, 1
phy set material restitution 1,0
phy build material 1
make object cube 2, 2.5
position object 2, 0, 30, 0
phy make rigid body dynamic box 2
phy set rigid body mass 2,1000000
color object 2, rgb ( 0, 0, 255 )
position camera 0, 5, -40
do
If MouseClick()=1 then phy set rigid body linear velocity 2,0,5,0
sync
phy update
loop
Coding is dangerous for health ...