Support, movement and growth in animals
Learning Standard:
Relate support system with animal’s stability
Learning Activities:
Good morning class. Today we are going to learn about support systems and the factors of stability in animals. A good support system enables an animal to move more smoothly and efficiently. The stability of an animals is different according to the point of equilibrium of the animal's support system. Before that, let's watch this amazing video.
The centre of gravity refers to the point of equilibrium of a support system or an object. It is the point where the weight of the support system or the object acts to balance the position of the support system or the object. Look at the diagram below. The centre of gravity is right in the middle of the object. This is the point where it keeps the object balanced.
The position of the centre of gravity in animals plays important roles in animals. Now let's think between horse and tortoise. Which animals do you think is more stable?The lower the animals, the lower the centre of gravity and the more stable it is. The higher the animals, the higher the centre of gravity and the less stable it is.
Stability is the ability of an object to maintain its original position. There are two factors that affect stability of an object that is:
1. Centre of gravity - the lower the centre of gravity, the more stable the object
2. Base area - the bigger the base area, the more stable the object
Watch the video below to understand more about the factors that affect stability.
Tall animals have problems to maintain their balance in their daily life. For example, the tall giraffe faces difficulty in drinking water. How do they overcome this problem? Watch this video.
The same condition is also faced by the kangaroos. This is because kangaroos jump and stand using two hind legs. The front feet of the kangaroo are not used for standing. This cause they become unstable when moving. How do they overcome the problem? Watch the video below.
Answer the questions below in a piece of paper. Make sure to write down your name and class on the paper before submit it in the WhatsApp group.
1. State the two factors that affect the stability of an animal.
2. What is centre of gravity?
3. What is the relationship between the height of an object and its stability?
4. Explain the way the giraffe stands while it is drinking water.
5. Between crocodile and camel, which animals is more stable. Explain your answer.
That's all for our lesson today. Complete your work by 4pm today. Thank you.
References:
1. KSSM Form 4 Science Textbook
2. http://sailskills.co.uk/Stability/sailskills_stability_stability_explained_centre_of_gravity.html
3. https://www.youtube.com/watch?v=9z0tHI-4_gc
4. https://www.youtube.com/watch?v=wjo0FeRtNME
5. https://www.youtube.com/watch?v=nf4H20UCYJs
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