forces - moments (whatyouneed2know)

Question 1

definition of moment?

Answer 1

a MOMENT is a TURNING EFFECT around a PIVOT resulting from a FORCE acting on a RIGID BODY

Question 2

moment equation? (rearranged too!)

Answer 2

moment = force x distance –> perpendicular distance to pivot

force = moment/
distance

distance = moment/
force

Question 3

what are the measurement labels for:
- moment
- force
- distance

Answer 3

moment - newton metres (Nm)

force - Newtons (N)

distance - metres (m)

Question 4

is it easier to use a longer or shorter spanner? why?

Answer 4

it is easier to use a longer spanner because if the distance from the pivot is larger, a smaller force is needed to rotate the object.

Question 5

what is the principle of moments?

Answer 5

when an object isn’t rotating (balanced), the sum of the anticlockwise moments must equal the sum of the clockwise moments

Question 6

principle of moments equation?

Answer 6

M1 + M2 = M3 + M4
–>
F1d1 = F2d2 = F3d3 + F4d4

F1d1 means:
force 1 x distance 1