Question 1

What is fluid dynamics?

Accepted Answer

Fluid dynamics is the study of how liquids and gases move. It's like watching water flow in a river or air blow in the wind.

Question 2

What are fluids?

Accepted Answer

Fluids are materials that can flow, like water, milk, honey, and even air. They don't have a fixed shape and can fill up spaces.

Question 3

Why do fluids move?

Accepted Answer

Fluids move because of forces like gravity or pressure pushing them around. Just like water flows downhill because of gravity.

Question 4

What is pressure in fluids?

Accepted Answer

Pressure in fluids is like the force that the fluid puts on something when it touches it. Imagine blowing up a balloon—the air inside pushes on the walls.

Question 5

How do airplanes use fluid dynamics?

Accepted Answer

Airplanes use fluid dynamics to fly. The wings are shaped to move air faster above them, which helps lift the plane into the air.

Question 6

What is buoyancy?

Accepted Answer

Buoyancy is the force that helps objects float in water. It's why a boat stays on top of the water and doesn't sink.

Question 7

What happens when a fluid flows faster?

Accepted Answer

When a fluid flows faster, its pressure goes down. This is like when you put your thumb on the end of a garden hose and the water sprays out faster.

Question 8

Can fluids change shape?

Accepted Answer

Yes, fluids can change shape easily because they can flow. That's why you can pour water into any shaped container and it takes the shape of the container.

Question 9

What is viscosity?

Accepted Answer

Viscosity is how thick or thin a fluid is. Honey is thick and flows slowly, so it has high viscosity, while water is thin and flows easily.

Question 10

Why does air move around us?

Accepted Answer

Air moves because of differences in temperature and pressure. Hot air rises and cold air sinks, which creates wind.

Question 11

How does fluid dynamics affect weather?

Accepted Answer

Fluid dynamics helps explain how air moves in the atmosphere, which affects weather patterns like wind, rain, and storms.

Question 12

What is the Bernoulli’s principle?

Accepted Answer

Bernoulli's principle says that when a fluid moves faster, its pressure gets lower. It's why airplanes can fly and how we can spray perfume from a bottle.

Question 13

What role does gravity play in fluid dynamics?

Accepted Answer

Gravity pulls fluids downwards. That's why rain falls, rivers flow downhill, and why we don't float away from Earth.

Question 14

Can gases be considered fluids?

Accepted Answer

Yes, gases can be fluids because they flow like liquids. Air is a gas that moves and fills spaces just like water does.

Question 15

How do submarines use fluid dynamics?

Accepted Answer

Submarines use fluid dynamics to float and dive. They change their weight by filling or emptying tanks with water to move up and down in water.

Question 16

What is a flow rate?

Accepted Answer

Flow rate is how much fluid passes a point in a certain amount of time. It's like measuring how much water flows out of a tap every second.

Question 17

What causes whirlpools and water tornadoes?

Accepted Answer

Whirlpools and water tornadoes are caused by water spinning around very fast. This happens because of differences in pressure and currents.

Question 18

What is a streamline?

Accepted Answer

A streamline is a path that fluids like water or air follow as they flow. It's like drawing lines to show the direction wind or water is moving.

Question 19

Why do rivers flow faster in the middle?

Accepted Answer

Rivers flow faster in the middle because there is less friction with the riverbed. The edges slow the water down due to rocks and plants.

Question 20

How do fish swim using fluid dynamics?

Accepted Answer

Fish swim by pushing water backwards with their tails and fins. This movement sends them forward, just like rowing a boat pushes it through water.

The Principles of Fluid Dynamics - 20 FAQs Explained Simply