Statics

Question 1

what is moment

Answer 1

force * perpendicular distance from pivot point to line of action of force.
unit = Nm

Question 2

what is principle of moments

Answer 2

in equilibrium, sum of clockwise moments around of point = the sum of the anticlockwise moments about the point

Question 3

what is a centre of mass

Answer 3

the point where all mass of an object can be considered to act

Question 4

what is a couple

Answer 4

when 2 forces of equal size act about a common centre, they form a couple, no resultant force, only turning