Cool Science Experiments For Kids

Reaction ?!!!

So your school teacher will tell you something like this…

According to Newton’s Third Law :-

But, what does he means by every action?

Or even opposite reaction ?

Questions, questions, questions…and more questions.

It is will simple to explain the above statement,

Punch the wall…how do you feel ? Pain right.
So when you punch the wall(action), and the wall reflect back the force of your punch on your hand(opposite reaction). That is why you feel pain.

When a car ramp into a wall at high speed…What happen ? The car bounce back from the wall.
Just go watch NASCAR, or any sports car racing.
The car ramp into the wall(action), it bounce back(opposite reaction)

Our next example is firing a gun. Warning: Hey, kids please do not please with guns. It is an serious offense. We can even hurt ourselves
When one fires his gun, he feels being pushed backwards. Fire guns(action), pushed backward(opposite reaction)

I hope everyone understand Reaction now.

Kids, today we gonna learn two new words.

STIMULI and RESPONSE

So, what is Stimuli ? and whst is Response?

Let’s define Stimuli:

Hey doc, the words changes around us sound deep.

Ok, ok. Let me give you guys some example of changes a.k.a Stimuli
Stimuli is known to us as touch, pain, heat, cold, sounds, food (chemicals) and light.

Let me further explain the stimuli to you.
- You feel and touch objects, that is a stimuli
- You look at things around you, that is a stimuli
- You feel cold, or hot, that is a stimuli
- You feel pain whe you fall down, that is a stimuli
- You hear sound, that is a stimuli
- You taste a burger, that is a stimuli

By now you should know what is astimuli. But, in our daily life, we deal with millions of stimuli and we call that Stimulus, which mean a lot of stimuli or plural form of stimuli.

When a stimuli or stimulus come to us. We response to it or them.
For every stimuli there is a response to it weather we aware or not. For example, when we touch anything hot like iron, we will feel pain. The response would be pulling back the hand to avoid pain.

Human need to respond to stimuli in order to protect themselves from danger or for survival.

For example:

Stimuli	Responses
Stepping on sharp objects like thumbtacks	We quickly pull away our foot
Smelling bad smells	Covering nose quickly to keep out the bad smells
The sound of loud thunder	We cover our ears when we hear a very loud sound

Hey, kids. I got a question for you guys.

What is living thing?

You may think that is simple. Living things are people. Or maybe living things can move. Or maybe living things has life.

Living are people. Then what about plants, insects, animals ?

Living things can move. Well, my car can move. Do we say my car is a living thing.

Living things has life. What is life in the first place?

There are so many answer. So, today we are gonna get clear answer.
But seriously how should we really define living things ?

So here we go…

Living things are organisms such as bacterias, viruses, fungus, humans, animals, plants and a whole lot more. Well, I know there are some term that are new to you but nevermind that.

I will explain to you living thing or more scientificaly organisms carry out a few life processes.
The few life processes are:-

1. Living things need food and water
Animals Find Their Own Food & Water	Plants Can Make Their Own Food
2. Living things can breathe or respirate
Plants Need to Breathe Too
3. Living things can move.
Walk, Run, Jump, Swim, Crawl...You Name It
Sunflower move with the direction of Sun	Roots will look for water
4. Living things can grow
Living Things Will Grow in Size, Height, Weight
5. Living things can give birth or reproduce
Animals & Human will reproduce or give birth	Plants use their seed to have more plant

Non Living Things is just no a living things. Simple.

I will pressume everyone of you have taken a bus. If you have not ride on a bus before, go out there and enjoy!

So what happen when a motionless bus started to move forward, you move backwords.

When a stop suddenly, you move forwards.

This is exspecially true when you are standing on the bus. If you wanna relive experience this, ask adults to accompany you to take a bus ride.

You will be asking me what is all this bus thing got to do with Inertia.

Ok. All object in the world (car, bike, bus, pens, you, your friend and many more) will continue moving (in motion) unless something stops them.

Again, all object is the world will continue stopping (not moving) unless something moves them.

But, objects being objects (verbs) will refuse/resist/object to start moving or stopping. The bahavior of the objects are known as Inertia.

That’s is why Newton’s first law of motion a.k.a Law of Inertia states:-

Who is Bernoulli ?

What is this principle about?

What it got to do in our daily life ?

Well, Daniel Bernoulli was born on 29 January 1700 in Groningen, Netherlands.

Here come the boring part :-

Bernoulli’s principle states that a steady flow of fluid (gas or liquid), the pressure of the fluid decrease when the velocity(speed) if the fluid increase and converse

Wow… what is all this pressure increase or decrease…it is confusing man…!!!

Ok, lets make this explanation simple.  Have you ever wonder why a huge and heavy airplane can fly in the air ?

How an aerofoil is lifted

So, if you look closely at side of an airplane’s wing. The shape of the wings is in the form of an aerofoil.

You notice that the top surface is slightly curve or arched, while the bottom surface is flat. When a wing in the form of an aerofoil speed through air, the air flow speed on top has to travel faster to cover a longer distance. The air flow speed below the wing is slower.

Again according to Mr.  Bernoulli,  “a steady flow of fluid (gas or liquid), the pressure of the fluid decrease when the velocity(speed) if the fluid increase”

In this case, the air flow on top of the wing is faster, therefore creating a lower pressure region on top of the wing. While the slower air flow under the wing creates an higher pressure region. Thus, the higher pressure helps the plane to take off.   That is why airplane speeds very fast through the runway before  it takes off.  Hey kids, please fasten your seat belts before you take off…!!!