Moments Flashcards

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1
Q

What is the moment of a force

A

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

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2
Q

What factors determine how strong the turning effect is

A
  1. size of force
  2. Its distance from the pivot
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3
Q

Equation for moments

A

Nm = F x D

Moments = Force x perpendicular distance from the pivot point

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4
Q

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

A

Nm

Newton metres

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5
Q

What does perpendicular distance mean

A

horizontal distance

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6
Q

Does the moment of a force act clockwise only

A

clockwise and anticlockwise

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7
Q

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

just name them

A
  1. net moment on object must be 0
  2. Principle of moments
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8
Q

What is principle of moments, and another name for it

A

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

also called rotational equilibrium

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9
Q

What is a couple

A

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

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10
Q

What is a torque

A

describes turning effect of the couple

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