Chapter 9 Edit

7/29/2019 Chapter 9 Edit

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T2: Modul P&P Aras 1&2Chapter 9: Stability (Kestabilan)

9.1 Stability (Kestabilan)

Centre of gravity (Pusat graviti)

1. The weight of an object is due to the ________________ force acting on it.Berat objek adalah disebabkan oleh ________________ bertindak ke atasnya

2. Although the gravitational force acts on all parts of the object, the weight can be considered toconcentrate at ___________ .Walaupun daya graviti bertindak ke atas semua bahagian objek, namun berat bertumpu pada

___________.

3. This point is called the ______________________ of the object.Titik ini dipanggil ______________________ objek.

Point of equilibriumTitik keseimbangan

Regular shape (Bentuk tetap) Irregular shape (Bentuk tidak tetap)

1. The centre of gravity of regularly shapedobject is at its centrePusat graviti objek berbentuk adalah di

pusat

1. The centre of gravity of irregularly shapedobjects is not so obvious.Pusat graviti objek berbentuk tidak sekatatidak begitu jelas.2. It can be determine using a

_________________Ia boleh ditentukan menggunakan3. The centre of gravity for these

Chapter 9: Stability1


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T2: Modul P&P Aras 1&2shapes is where the lines

_________________Pusat graviti bagi bentuk ini adalah digaris _________________

9.2 Importance of stability

Factors affecting the stability of an object.

Position of centre of gravity Base area

An object with lower centre of gravity is

______________than an object with a

higher centre of gravity

Block _______ is more stable because the centre

of gravity is ____________

An object with a bigger base area is

__________________ than an object with

a smaller base area.

Block ______ is more stable because the base

area of block ______ is ______________

1. The stability of an object can be improved by:

a) Lowering its__________________

b) Increase its _________________

2. State how the object or animal below improve their stability

1. 2.



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T2: Modul P&P Aras 1&2

Spread out the legs to

______________ the

centre of gravity and _____________ the

base area.

___________________ base area

___________________ centre of gravity.

Examples of the application of stability in everyday life:

a) Standing fans and refrigerators in our

homes are designed with

________________ to make them

stable.

b) Table and chairs usually have legs set far

apart to __________ their base area

c) The heavy engines of vehicles such as

cars, buses and lorries are located at the

bottom to ___________ the centers of

gravity of the vehicles

d) Tall building, houses, school and factories

are usually built on heavy concrete

foundation for ______________



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Reinforcement Exercise (Stability)

1. Diagram 1.1 shows three animals K, L and M.

a) Based on Diagram 1, state the animals that is;

i) Most stable - _______________________________________________ii) Least stable - _______________________________________________

2. Study the diagrams below. Then fill in the blanks to show how the objects are made stable

1. Measuring cylinder

It has a large ______________

for stability

2. Table

The legs are set far apart to giveit a large _________________

for stability

3. Retort stand

It has a ________ base area.

The base is also made thick and

heavy to ________its centre of

gravity


DIAGRAM 1 MLK


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T2: Modul P&P Aras 1&24. Bus

The heavy engine of a bus is

located at its bottom to________

Its centre of gravity. It also has

wide and big tyres to give it a

__________ base area.

5. Rack

Heavy and large items are

placed at the bottom of a rack to

lower the __________________

6. Racing car

A racing car has a wide tyres

that a set far apart. These give it

a very large ______________.

Furthermore, the car is build low

so that it has a low

______________


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Chapter 9 Edit