Chapter 5: Turning Effects of Forces Flashcards
1
Q
Principle of Moment
A
When object is in equilibrium, the total clockwise moment about a pivot is equal to the total anti-clockwise moment about the same pivot.
2
Q
Centre of Gravity
A
The centre of gravity of an object is the point on the object where the whole weight seems to act
3
Q
Stability
A
The measure of the ability of an object to return to its original position when displaced
4
Q
Stable Equilibrium
A
- Object able to return to original position when displaced
- Object’s line of action of weight passes through base area
5
Q
Unstable equilibrium
A
- Object NOT able to return to original position and changes in its position when displaced
- Object’s line of action of weight does not pass through base area
6
Q
Neutral equilibrium
A
- Object NOT able to return to original position when displaced and stays in displaced position
- Object’s CG at pivot
7
Q
Ways to increase stability
A
- Increase base area
- Lower CG by adding mass at bottom
