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Principles of marketing chapter 9 TB
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CHAPTER 9
Stability
CHAPTER 9
Stability UNIT 9.1 Understanding that the centre of gravity affects stability
Determine the point of equilibrium in regular and irregular shapes Relate the point of equilibrium as the centre of gravity of objects Relate the centre of gravity to the stability of objects
WHAT
IS
STABILITY ?
Stability of an object refers to its ability to maintain its original position.
An object is stable if it can return to its original position when tilted and released. Tilted
It returns to its original position
and released
An object is unstable if it cannot return to its original position when tilted and released. Tilted
and released
It cannot returns to its original position
The Point of Equilibrium What is the ‘point of equilibrium’?
The point of equilibrium is the point where the whole weight of an object appears to act on. The point of equilibrium of an object is actually the centre of gravity of an object It is the point at which the Earth’s gravity acts on an object.
Centre of gravity
Location of the centre of equilibrium
Centre of gravity
9.1 Sta i ity
Point Of Equilibrium / Centre of Gravity • Gravitational force acts on every part of an object. • However, its weight can be considered to be concentrated at one point. This point is its centre of gravity. • The object can be balanced when supported at its centre of gravity.
The point of equilibrium of an irregular shape can be determine as follow Thumb tack
Thick cardboard of irregular shape
Plumb line 1. The cardboard was suspended consecutively from the points A, B, and C together with a plumb line. 2. The 3 verticals lines that were drawn along the plumb line intersected at a point. 3. The cardboard could be balanced at the point of intersection of the 3 vertical lines.
The point of equilibrium of an irregular shape can be determine as follow Step 1:
Step 2:
Step 3:
Result : 4. This means, (a) Point of equilibrium of an irregular shape is located at the point of intersection of the 3 lines (b) Point of equilibrium of an irregular shape can be determined by this experiment.
Centre of Gravity in Regular Shapes The centre of gravity of regularly shaped objects is usually at the centre
c.g.
c.g.
c.g.
2 factors affecting the stability of an object • The position of the centre of gravity of the object • The base area of the object
Centre of gravity
Base area
Centre of gravity of an Object
The lower the centre of gravity of an object, the more stable the object.
Stable
More stable
Most stable
Base area of an Object
The larger the base area of an object, the more stable the object.
Stable
More stable
Most stable
CHAPTER 9
Stability UNIT 9.2
Appreciating the importance of stability
Suggest ways to improve the stability of objects around them Explain with examples the application of stability in life
How To Improve The Stability Of an Object Improving the stability of an object
Lowering its centre of gravity
Increasing its base area
Importance of Stability Many appliances are designed to have a low centre of gravity for stability:
Lower the centre of gravity
The principle of stability is applied to many aspects of our daily life
Increase base area to gain stability
The principle of stability is applied to many aspects of our daily life
