Moments

Question 1

What is a moment?

Answer 1

The turning effect of a force around a point. It’s the force x the perpendicular distance from the pivot to the line of action of the force.

Question 2

What does the moment of a force depend on?

Answer 2

The size of the force and how far the force is applied from the turning point

Question 3

What does the principle of motion state?

Answer 3

That for a body to be in equilibrium, the sum of clockwise moments about a point must be equal to the sum of anticlockwise moments about the same point

Question 4

What is the equation for moments?

Answer 4

M = F x d

Question 5

What is the equation for a couple?

Answer 5

Moment of a couple = size of one of those forces(N) x perpendicular distance between the lines of action of the forces(m)

Question 6

What are moments measured in?

Answer 6

Nm (newton metres)

Question 7

What does a couple not cause?

Answer 7

Any resultant linear forces

Question 8

What is the long equation of the moment of a force?

Answer 8

Moment of a force = force(N) x perpendicular distance from the point to the line of action of the force(could also be specified as the pivot)