ok remember..
Force = mass x acceleration ( farther = mother)
moment = force x perpendicular distance, in other words, force =
moment /perpendicular distance
gravitational force = 9.81 or 10( both constant) x mass
as u could see, gravintational force is somehow like F=MA, just
that the acceration is replaced by gravitational pull(9.81m/s^2 or
10m/s^2 depending on your syllabus)
so there are only 2 formulas you need to remember. the third one
can be derive by replacing 9.81 or 10.
so.. when the question ask u about force topic, write these 2
formulas on the paper first (f=ma and moment = force* dist)
when u see mass given of the object in the qn, note the mass
if u see
acclereation, or falling object(falling object is at 9.81m/s^2 or
10m/s^2 unless resistance of air), note it .
so mass given, accleration given... u see the formula.. which one
contains mass and acceleration? F=MA right?
do same as the moment formula too.
sometimes u have to play around with the forumla..
F=ma can also be A=f/m or M=f/a
