4.5

Question 1

Definition of moment

Answer 1

• The turning effect of a force about some axis or point
• moment = force x perpendicular distance of the line of action of force from the axis / point of rotation / pivot point

• moment = F x d
-measured in Nm

Question 2

Equilibrium definition

Answer 2

• Net force is zero
-horizontal + vertical components balanced

• Net moment is zero
-principle of moments

Question 3

What is the principle of moments

Answer 3

Body in rotational equilibrium, sum of anticlockwise moments about a point is equal to sum of clockwise moments about same point