Turning Effect of forces Flashcards
What is the formula for a moment
M = F x D
Why is it easier to apply a force further away from the pivot
by maximising the perpendicular distance between the pivot and line of force, we can apply a smaller force and yet attain a greater turning effect
What are the conditions for a body to be at equilibrium
the net force acting on the body must be zero (translational equilibrium), and
the net moment acting on the body must be zero (rotational equilibrium).
What is the principle of moments
The Principle of Moments states that for a body in rotational equilibrium, the sum of clockwise moments is equal to the sum of anti-clockwise moments about the same pivot
What is the formula for the principle of moments
Sum Moments CW = Sum Moments ACW
What is the Centre of gravity?
The centre of gravity (C.G.) of a body is the point from which the entire weight of the object appears to act from
What is stability
The stability of a body refers to the ability of the body to return to its original position after it has been displaced by a certain angle.
when is an object more stable?
An object is more stable when it has a low centre of gravity and a wide base
When displaced slightly, the line of action of the weight cuts through the base area, causing a restoring moment, and the body rotates back to its original position.
when is an object less stable?
An object is less stable when it has a toppling moment and a narrow base
When displaced slightly, the line of action of the weight does not cut the base area, causing a toppling moment, and the body falls into a new position.
