African Bird "Cries Wolf" To Steal Food

  

Hey guys, I'm back with a new topic. This time I'll be talking about Africa's fork-tailed drongo that makes fake danger calls, just to steal food from other birds. Over the years, scientists have studied the fork-tailed drongo and have discovered that is has learned how to mimic a few other danger calls of other species that live in the Kalahari Desert.

Fork-tailed drongos aren't the only birds that have mastered the art of mimicry, but they're the first ones that are known to be smart enough to use it to their advantage and to change the way it sounds if the first try fails. 

Even though they are small in size, are very aggressive and aren't afraid to take on predators such as hawks and eagles, especially if their nests are threatened.

Something that I found interesting is that it could change the way the mimicked danger call sounded. I chose this topic because I like animals and how they react differently to things. 

That's all for today guys see you next time.

Fork-Tailed Drongo 

Waves

Hey guys, I'm back and today I'll be talking about waves, but not just one type of wave, I'll be talking about almost all of them. I'll talking about electromagnetic waves, seismic waves, sound waves, mechanical waves, transverse waves, and compressional waves. Waves carry energy and not matter.

 

The amplitude of a wave is the amount of vibration inside of that wave. The difference between a electromagnetic wave and mechanical wave is that mechanical waves need a medium to carry their energy through, while electromagnetic waves can basically travel through empty space. How do you think sun rays get to Earth.





There are two different type of mechanical waves. Transverse and Compressional waves. Compressional waves compact together, while Transverse waves move in a right angle. To make a sound wave you have to make an object vibrate, an exaxmple is hitting a metal spoon against a metal railing.

The crest of a wave is the top of a wave, the trough of a wave is the bottom of a wave, amplitude is the maximum amount of a vibration in a wave, wavelength is measured from crest to crest and also from trough to trough, and frequency is the number of waves past a certain point per second.

                       That's all for today guys see ya next time.

Newton's Laws of Motion

Hey guys, today I'll be talking about Newton's Laws of Motion. Newton's First Law of Motion is the Law of Inertia. Newton's Law of Inertia states that an object at rest tends to stay at rest, unless an unbalanced force acts on the object and causes the object to move. An example of Newton's Law of Inertia is a ball at rest doesn't have any inertia until an unbalanced force acts on the ball and causes the ball to be put in motion.

Another example of Newton's Law of Inertia is shown in the picture below.

 



 
Newton's Second Law of Motion is the acceleration of an object equals the net force divided by the mass and is in the direction of the net force. An example is a soccer ball sitting still and then somebody goes and kicks it.




Now lets talk about Newton's Third Law of Motion. Newton's Third Law of Motion is that forces always act in equal but opposite pairs. Another way of saying this is for every action there is an equal, but opposite reaction. This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.
That's all for today guys, see you next time. Wait quick question.

Gravity

Hey guys I'm back, and today I'll be talking about gravity. Gravity is the force that is pulling you towards the center of the Earth and that keeps you from flying off into space. Except gravity isn't the only force acting on you. In 1589, there was a scientist named Galileo Galilei who had done an experiment that is still known to people now. He created an experiment where he dropped two balls of different masses from the top of the Leaning Tower of Pisa, to show that their time of descent was independent of their mass.
The day that Galileo died, Isaac Newton was born, which was kind of ironic because when one great scientist died, another was born. The once to be great scientist, and that was Sir Isaac Newton.

That's all for today guys, sorry it was short this time.

Force

Hey guys I'm back, and I'll be talking about force. Force is a push or a pull. There are so many different ways force is used, (not the force from the Star Wars Saga). There are so many different examples for force, but I'm only listing three. Let's say a ball is on the ground, motionless, then you pick it up and throw it, you just used force to throw the ball.

I know I don't ever put puns in my blog, but I'm bored so may the force be with you. Anyways back to what I was talking about. There isn't just one type of force, there are way more, but I'm only going to talk about a few different ones. There is balanced force, unbalanced force, net force, and centripetal force. A balanced force when two or more forces push on an object and the object doesn't move or change in velocity, then the forces are balanced.

An unbalanced force is when two people are pushing on both sides of a door. One person is stronger than the other person. The person with more strength will begin to move the door towards the other person. Therefore, the force is unbalanced or is an unbalanced force. Now let me tell you what a Newton is. 

(Again, not used to doing puns) and no, not Fig Newtons. A Newton is the SI unit of force. It's equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second, and is equivalent to 100,000 dynes. Now let me talk about net force. Net force is the overall force acting on an object. 

For example, two people could push on a book at the same time, but in opposite directions. If the guy on the left was pushing the book with more force, then the prevailing force would be on the left and in this case, prevailing force is called the net force. Now that's what I call Big Data! Well guys, that's all for today see you next time. 

Acceleration

Hey guys I'm back and today I'll be talking about acceleration. Acceleration is the change in velocity divided by the time it takes for that change to occur. Acceleration is happening in the picture below.

 There are three types of acceleration. They are positive acceleration, negative acceleration, and velocity. An example of positive acceleration is speeding up, and example of negative acceleration is slowing down, and an example of velocity is changing the speed and the direction of an object. You also should know how to calculate the acceleration of an object. Acceleration can be calculated using a specific formula.

The formula that is used to calculate acceleration is (final speed (in meters/seconds) minus initial speed (in meters/seconds)), which is then divided by time (in seconds). There are many differences between positive acceleration and negative acceleration, but I'm only going to list a few of them. One of the differences is positive acceleration is when an object is accelerating when it speeds up, and the acceleration is in the same direction as the motion, but negative acceleration is when an object is accelerating when it slows down, but the acceleration is in the direction opposite to the motion.
That's all for today people see you next time.   

Motion

Hey guys I'm back, and today I'll be talking about motion. I know it has been a while, but I'm back. Motion is the movement of an object from one place to another. There are many different things that are related to motion, one of them being speed. An example of motion is the ball in the sport soccer or fútbol for you English people.

Another example is a bicycle kick like the one shown below

 

Now I'll talk about relative motion. Relative motion is when an object changes it position from one place to another. One example is when one person starts out on one side of a tree and then moves to the other side of the tree. Another example of relative motion is if you are at the start line, then you pass the finish line that is also relative motion. Now lets talk about speed and the different types of speed.

 

Speed is how fast an object is moving. Speed is measured in Mph and Kmh. The speed of an object is measured by a speedometer. The speed of the ball changes (shown below).

 

There are two types of speed. They are average speed and instantaneous speed. Average speed is found by dividing the total distance traveled by the total time taken. Instantaneous speed is the speed of an object at one instant of time is the object's instantaneous speed.
Think about walking to school, if it takes you 0.5 hours to walk 3 kilometers to school your average speed would be 4 km/h. Except you most likey didn't sustain the same speed throughout the walk.