Rockets 101 – How to turn during flight ? 

To be able to control is what distinguishes a toy rocket from a real one. And it is of quintessence to be able to channel the rocket’s direction. To be able to fly is cool, but you what is ever more cool, to be able to pinpoint the destination and its trajectory.

In most modern rockets, this is accomplished by a system known as Gimbaled Thrust.


In a gimbaled thrust system, the exhaust nozzle of the rocket can be swiveled from side to side. As the nozzle is moved, the direction of the thrust is changed relative to the center of gravity of the rocket and a torque is generated. As a result, the rocket changes direction. After necessary corrections are made, the exhaust nozzle is brought back to its initial state.


The angle by which the rocket’s nozzle swivels is known as the Gimbaled Angle.

Up, Up and Away! 


PC: NASA, learnengineering, achingtentacles,campnavigator

How does an eraser work?



What happens when you write?

Although we call the black stuff in pencils “lead,” it’s not the real metal known as lead.It’s actually a mineral called “graphite,” which is made up of carbon. When you write with a pencil, graphite particles from the pencil rub off and stick to the fibers of the paper you’re writing on.

What do erasers do?

When you rub an eraser across a pencil mark, the abrasives in the eraser gently scratch the surface fibers of the paper to loosen the graphite particles. The softeners in the eraser help to prevent the paper from tearing. The sticky rubber in the eraser grabs and holds on to the graphite particles. 

The physics.

Erasers work because of friction.

As the abrasives in your eraser are rubbed against paper, friction produces heat, which helps the rubber become sticky enough to hold onto the graphite particles. As the rubber grabs the graphite particles, small pieces of combined rubber and graphite get left behind. That’s the “stuff” you brush off of your paper when you’re finished erasing. 


Every action has an equal and opposite reaction.

To decelerate the aircraft, the forward thrust of the aircraft which propels the aircraft forward is reversed by a Thrust Reverser. This is accomplished by redirecting all the air ( in small engines ) or partially ( in larger engines ) to the front.  


Due to the flow of air to the front end of the aircraft, a reaction force acts in the opposite direction to the motion of the aircraft. This aids in the deceleration of the aircraft.

Know Physics, Know Fun.

You don’t need to understand the mathematics to be able to appreciate physics. For physics is the study of nature. Albeit the physics gets lost in the amusement, its existence cannot be dismissed.

The constructive interference of waves leads to the formation of that huge amplitude in the middle of the pool. And only when you actuate the pool by the driver at particular frequencies do you get the maximum amplitude for vibration- Resonance!

The Vapor Cone.

A vapor cone, also known as shock collar or shock egg, is a visible cloud of condensed water which can sometimes form around an object. A vapor cone is typically observed as an aircraft, or object, flying at Transonic speeds. ( slightly slower than the speed of sound) 

The Pressure – Temperature dependence.

As the aircraft approaches the speed of sound, the air pressure around the object drops, and thereby the air temperature drops. If the temperature drops below the dew point, water in the atmosphere condenses to form a cloud in the shape of the shockwave.

Red Bull Stratos and the Vapor Cone.

Remember that epic jump where Felix Baumgartner, as a part of the Red Bull Stratos project broke the sound barrier ( reached Mach 1.25 ) during his descent? But why weren’t vapor cones seen around Felix’s body? Or were they?


Vapor cones are formed only near the ground, where plenty of wet air persists. But when Felix broke the sound barrier, there was no wet air that surrounded him that would enable the formation of Vapor cones.

Have a Good day!

PC: twistedsifter

This is what happens when Two Black Holes Collide.

This is the animation of the final stages of a merger between two black holes. What is particularly interesting about this animation is that it highlights a phenomenon known as Gravitational Lensing.

What is Gravitational Lensing?

Mass bends Light. What? 

Yeah, mass can bend Light. The gravitational field of a really massive object is super strong. And this causes light rays passing close to that object to be bent and refocused somewhere else.


The more massive the object, the stronger its gravitational field and hence the greater the bending of light rays – just like using denser materials to make optical lenses results in a greater amount of refraction.

Here’s an animation showing a black hole going past a background galaxy.


This effect is one of the predictions of Einstein’s Theory of General Relativity 

PC: cfhtlensUrbane Legend