Turning effect of forces Flashcards
1
Q
Define moment of a force
A
Moment of a force is the product of the force and the perpendicular distance from pivot to the line of action of force
2
Q
What is the principle of moments
A
For an object in equilibrium, sum of clockwise moments about any point equals to the sum of anti-clockwise moments about the same point
2
Q
Define centre of gravity
A
Centre of gravity is the point at which the weight of an object appears to act
3
Q
What are the conditions for an object to be in equilibrium
A
- Resultant force on object is zero
- Resultant moment about any point on object is zero
4
Q
Where is the CG in balancing toys
A
Directly below the pivot
5
Q
Define stability
A
Stability is the measure of an object’s ability to return to its original position after it is slightly displaced
6
Q
How to increase stability of an object
A
- Lower its CG
- Increase base area
