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Short Answer Type Questions

1. Differentiate between freefall and weightlessness.

2. Why is the wall of a dam made wider at the bottom?

3. Why is it easier to swim in the sea than in a river?

4. Why is potassium more reactive than sodium?

5. Write any two disadvantages of the modern periodic table.

Sagot :

GinnyAnswer

Final answer:

Freefall is falling under gravity, weightlessness is freefall feeling no weight, a dam is wider at the bottom to distribute pressure, swimming is easier in the sea due to buoyancy.


Explanation:

Freefall is when an object falls only under the influence of gravity, experiencing an acceleration due to gravity. In weightlessness, an object is in freefall but also experiences a sensation of zero weight due to being in a state of continuous freefall around a planet or celestial body.

The wall of a dam is wider at the bottom to withstand the pressure exerted by the water it holds. The wider base distributes the force over a larger area, reducing the pressure at any specific point on the dam.

It is easier to swim in the sea than in a river because the sea has higher buoyancy due to its salt content which makes it easier for a person to float and swim. In contrast, fresh river water has lower buoyancy.


Learn more about Physics concepts here:

https://brainly.com/question/13220502


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