Moments

Question 1

What is the moment of a force

Answer 1

It is a measure of its tendency to cause a body to rotate (whatever direction) about a specific point or axis

Ie.

The force behind that turning (tipping) effect

Question 2

What factors determine how strong the turning effect is

Answer 2

1. size of force
2. Its distance from the pivot

Question 3

Equation for moments

Answer 3

Nm = F x D

Moments = Force x perpendicular distance from the pivot point

Question 4

What is unit of moments, or what is it measured in

Answer 4

Nm

Newton metres

Question 5

What does perpendicular distance mean

Answer 5

horizontal distance

Question 6

Does the moment of a force act clockwise only

Answer 6

clockwise and anticlockwise

Question 7

What 2 conditions must moment be in order for an object to be in static equilibrium

just name them

Answer 7

1. net moment on object must be 0
2. Principle of moments

Question 8

What is principle of moments, and another name for it

Answer 8

Sum of clockwise moment about any point = sum of anticlocwise moment about the same point

also called rotational equilibrium

Question 9

What is a couple

Answer 9

2 forces of same size, but acting in opposite directions. There is force equilibrium but no rotational equilibrium

Question 10

What is a torque

Answer 10

describes turning effect of the couple