Moment

Question 1

What is moment

Answer 1

The turning effect of a force about a pivot

Question 2

How to calculate the size of moment

Answer 2

M = F × d

Where:
M = moment in newton metres (Nm)
F = force in newtons (N)
d = perpendicular distance of the force to the pivot in metres (m)
The forces should be perpendicular to the distance from the pivot
For example, on a horizontal beam, the forces which will cause a moment are those directed upwards or downwards

Question 3

What is the principle of moment

Answer 3

A system will not rotate ( is in equilibrium) if the clockwise moments equal the anti-clockwise moments

Question 4

How can you find the centre of gravity for regular shapes

Answer 4

lines of symmetry

Question 5

How can you find the centre of gravity for irregular shapes

Answer 5

Hang up the object
Suspend from a location near the edge
Hang from a plum line and mark the object
Do the same from another location
Where they intersect is the centre of gravity