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Hi elle
m is used for "mass", but is a variable, not a constant (important difference!) c is a constant, though

Hi, Chris!
I thought "mass " - defined as the amount of matter present in a body - was a constant, whereas "weight" varied, since the force of gravity varies.
Maybe it depends on whether mass is defined as "inertial" or "gravitational"?
But please don't blind me with science, as it's far too long since I did "A" level Physics!
I'll just stay in blissful ignorance!

bozherald explained in post 9 re his error so the m by itself is irrelevant.

I think we've moved on to another plane, entirely, Stevie!

Hi again elle
In an expression like (to take a simple one)
F=ma
the m can take any value, thus affecting the acceleration as a result of the force applied
For a given body, the same "m" appears in the equation giving the gravitational force, so it cancels out, and all bodies fall at the same acceleration (ignoring air resistance)
You are right, though, that changing the gravitational force will change the weight of a body, but not its mass.
Sorry if that takes you too far back to A level Physics!

Hi, Chris!
I am happy with my knowing that changing the gravitational force will change the weight of a body, but not its mass!
I shall rest on my laurels…...

55 across Putting by a single day to travel around island ( 6, 5 )
L?Y?N? A???E

54 across One studying is worse off when it's half-hearted ( 5 )
P?R?R

9 down Minor upset with sour milk (4, 3)
D?A? O?F

51 down Part of windmill also called elevated room ( 4, 3 )
S??? A?M (SAIL ARM? )

laying aside

porer

draw off

sail arm

Thanks Cerasus

Struggling to parse this:

18A Likely for pet's vice to be fixed (11) - P?O?P?C?I?E

It has to be PROSPECTIVE but that isn't an anagram of FOR PET'S VICE.

Any insight would be welcome.