Re: Quiz - Question of the Day
i wasn’t correcting you, i just added some more(unrequired) info. to the discussion. 
i wouldn’t dare correct you. you seem to know very well whatever you speak(write). Like when you say that all of the fundamental forces were believed to be a single force at the beginning, and later they were isolated when the temperature of the universe fell. It is consistent with what scientists believe that at extremely high temperatures, all fundamental forces are unified into a single force.
About gravity,
in textbooks they refer to gravity as the acceleration due to gravity. i’ll explain.
suppose there are 2 bodies of masses m1 and m2. the gravitational force of attraction between them would be equal to : F= Gm1m2/r[SUP]2[/SUP]
where ‘r’ is the distance between the two bodies and ‘G’ is the universal gravitational constant.
according to Newton’s 2nd law of motion: force=massacceleration or F=ma
so if for any one of the bodies (say m1) the (gravitational) force acting on it would be F= m1*(Gm1/r[SUP]2[/SUP]), where m1 is its mass and Gm1/r[SUP]2[/SUP] is its acceleration. lets say Gm1/r[SUP]2[/SUP] = g, so for the body with mass m1, F = m1g
so the ‘g’ here is the acceleration m1 experiences due to the gravitational force exerted by m2
this ‘g’ is different for different bodies. on earth is it 9.8m/s[SUP]2 /SUP, on the moon it is about 1.6 m/s[SUP]2[/SUP].
technically when we say gravity, we refer to this ‘g’
I KNOW all the above wasn’t required but i had the time and i wanted to rekindle some of my elementary physics. Sorry for the long post. Thanks for reading. 