Question

3. Fill in the blanks :
(i) Two forces act on a body immersed in water, one is its weight and the other is
(a) the lower part of a dam is​

Answer 1

Answer :

1) On a body immersed in water two forces act on it,

1. The weight of the body on the water
2. The water's force on the body

2) The lower part of a dam is always constructed stronger and wider than the upper part

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• The force of the water pushing the immersed body up is called as the buoyant force $\sf .$

• When we try pushing a bottle down a bucket full of water, the bottle applies a force against the water and in return the water molecules push the bottle up as we feel it and this is an example for buoyant force

• Dams are constructed wider and stronger at the bottom to withstand the high pressure of the water molecules. As we go deeper the pressure increases and if they aren't built strong enough then there is a risk of the dam breaking down.

Answer 2

Answer:

Question :-

(i) Two forces act on a body immersed in water, one is its weight and the other is

Answer :-

• The weight of the body on the water
• The water's force on the body

Explanation :-

The image (in the attachment) shows how an immersed in water is. The force which is pulling the object is immersed body up is called as the buoyant force.

Question :-

The lower part of a dam is

Answer :-

Always constructed stronger and wider than the upper part

Explanation :-

Now the question arises why is it so? (Refer to the image 2). The upper part of sea have low pressure. Therefore,it is constructed thin but the lower part of sea have high amount of pressure. That's why the lower part of dam is constructed thick.