Turning Effects of Forces - 5
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1
What is a turning effect known as?
Moment
2
What are the 2 factors that affect the turning effect?
Perpendicular distance from the pivot to the line of action on the force; Magnitude of the applied force
3
What is the moment of a force?
It is the product of the force and the perpendicular distance from the pivot to the line of action of the force
4
What is the formula for moment?
$Moment\space (Nm) = Force\space (N)\space \times \perp distance\space (m)$
5
What is the principle of moments?
For a body at equilibrium, the principle of moments states that the sum of clockwise moments about a pivot is equal to the sum anti-clockwise about the same pivot
6
What are the 2 conditions for equilibrium
The resultant moment about a pivot is 0 and the resultant force on the object is also 0
7
What is centre of gravity?
It is an imaginary point at which the entire weight of the body acts on
8
What is stability?
It refers to the ability of a body to restore to its original position after it’s displaced
9
What are the factors that increase stability?
Its centre of gravity is as low as possible, and the area of its base is as wide as possible
10
If a toy topples, how does it eventually come to a stop after being let go
When toppled, the weight of the lead causes a clockwise moment about the pivot, causing the toy to turn clockwise and return to its upright position