During 17th century, Daniel Bernoulli investigated the forces present in a moving fluid, derived an equation and named it as an Bernoulli's Equation. Below image shows one of many forms of Bernoulli's equation.
The Bernoulli equation gives an approximate equation that is valid only in inviscid regions of flow where net viscous forces are negligibly small compared to inertial, gravitational or pressure forces. Such regions occur outside of boundary layers and waves.
Bernoulli Equation
Image Source: Hyperphysics

Despite its simplicity, Bernoulli's Principle has proven to be a very powerful tool in fluid mechanics.
Care must be taken when applying the Bernoulli equation since it is an approximation that applies only to inviscid regions of flow. In general, frictional effects are always important very close to solid walls and directly downstream of bodies.
The motion of a particle and the path it follows are described by the velocity vector as a function of time and space coordinates and the initial position of the particle. When the flow is steady, all particles that pass through the same point follow the same path and the velocity vectors remain tangent to the path at every point.
According to Varignon's theorem, the algebraic sum of several concurrent forces about any point is equal to the moments of the moments of their resultant about the point.
Halfbike 2 is designed by architect Martin Angelov, co-founder of Tuscon, Arizona-based transport design company Kolelinia.
three wheeled Halfbike on city street
Halfbike team has taken the core driving mechanism of a classical bicycle (a wheel connected to a crankset). The result - a pedal powered 3 wheeler vehicle that trains your balance and reflexes in a new way. Halfbike 2 not only affects your physical level but also affects the way you perceive movement and enhances your senses. The standing rider position is essential for the Halfbike 2. It brings you closer to natural walking and it’s the only way to control the vehicle with your whole body and not just your hands.
Halfbike on city street
Halfbike 2 has pedal same as bicycle. In halfbike 2 there is no seat to sit, rider has to stand on pedal, and apply force on it to move forward. Backside wheels are very short compared to front wheel.
Halfbike folded

Halfbike Specifications:
The Halfbike is 1.1 metre long and 1 metre high, it can be folded in half can fit easily in the trunk of car. It Weighs around 8kg, the frame is made from aluminium metal with the handlebars formed from treated plywood. It is available in two variant colors black and white.
Halfbike 2 Specifications
Halfbike team emphasize on the clear and minimalist design and optimized details for better navigation in the city streets.
Check out Halfbike II and Kickstarter pages for more details.
Chinese Company CSR Qingdao Sifang (a wholly-owned subsidiary of China South Rail Corporation) has made the world's first Hydrogen powered tram aimed at introducing an environment friendly option to the Chinese mass transit sector. This is the first time that hydrogen energy has been applied in the tram manufacturing. China has also become the first country to possess the technology to make hydrogen-fueled streetcars.
China's First Hydrogen-powered Tram
For completing this project it took 2 years with help of research institutions.

Instead of burning fossil fuels for running of the tram, the engine is run by burning pure Hydrogen. Hydrogen fuel reacts with Oxygen in a Hydrogen fuel cell to produce heat which is used to drive the engine. These Hydrogen Fuel cells are used and tested in different types of vehicles, including buses.
Hydrogen fuel cell tank
Though the technology Hydrogen-powered tram is far from new, it has never been tested on this large scale before and the biggest predecessors have been much smaller automobiles. It has become a source of new debate whether such locomotives can replace the contemporary ones that are fuming clouds of toxic emissions daily.
Inside seats of tram
Image courtesy of news.cn
Each tram has 60 seats and can transport at least 380 passengers at a time. This tram gets enough power from just one tank of hydrogen to travel 100 km at a top speed of 70 km/h. Recharging hydrogen fuel tank of the tram takes about 3 minutes.

Source: The Times of India
Skateboard Bolt is designed in Italy, created by Lorenzo Cella. He is a robotic engineering student and a commuter. It's not just an electric skateboard. Bolt is something new. It is the world's smallest electric vehicle.
Electric skateboard bolt picture
Bolt is the first really portable vehicle that can be carried anywhere. At home, in the classroom or in the office.
It is an amazing mean of transport: small, lightweight, easy to use, with a low power consumption and smart.
Bolt gives its best in short trips from home. Go to to class, to the gym, to university, to cafeteria, to the library.

Electric Skateboard size comparison
skateboard size comparision
Fast
Bolt has a top speed of 21 kmph and it's just as fast as a bicycle!
It has a range of about 10 kilometers, more than what you need for the short daily commute in the city.

Portable
Bolt has dimensions of 60x25x10.5cm (23.5x10x4 inches) is the smallest electric skateboard in the world and is compact enough to be carried anywhere.

Light
It has a 4 kg of weight, it is light enough to be carried with no effort on your backpack or by hand when not in use.

USB Port
Bolt has a built-in standard USB port that can be used to recharge your devices on the go. Bolt's battery is so powerful that can recharge your mobile up to 20 times.
Bolt can also charge your phone

Technical Specifications
Size: 60x25x10cm (23x10x4 inches)
Weight: 4kg (9 pounds)
Power: 2000W, Sensored Motor
Battery: 5000mAh LiPo
Materials: Wood
Connectivity: Bluetooth Low Energy
Integration: Smartphone App
Charging: From empty to charge full in about 60-90 minutes
Electric Skateboard BOLT features

During motocross racing, riders have been facing with many choices on the race track design and conditions. To stand first in racing competition, rider has to choose the best lines on the racing track. Many factors exist when deciding which line to take through a corner.
Kinetic Energy, Newton's First Law of Motion, Earth Gravity affect motocross rider when trying to take some tricky corners on race track.

This visual infographic helps the motocross riders to pick the fastest line.
Motocross Racing Facts
Infographic credits: motogrossgear.com
Equation shown in the image is the Stefan-Boltzmann law. "P" is the power radiated by the ideal radiator and 'σ' is is the Stefan-Boltzmann constant, which has the value
σ = 5.67*10-8 Wm-2K-4
Stefan–Boltzmann law equation

Where 'P' is in Watts, emissivity (e) has no units, Area (A) m2 and Temperature (T) is in Kelvin. In the thermodynamic analysis the energy density is related from a square per unit time and per unit area. Thus the heat interior surface of an enclosure produces a certain energy density of thermal radiation in the enclosure. We are interested in radiant exchange with surfaces - hence the reason for the expression of radiation from a surface in terms of its temperature.
Russia’s T-14 tank, based upon 'Armata' universal chassis system, weighs 48 tons. The T-14 war tank was equipped with an adjustable suspension capable of adapting to varying relief, terrain type and vehicle speed, resulting in increased speed while moving in columns, as well as over rugged terrain. The suspension system of T - 14 tank will also alleviate crew fatigue, while assisting the fire control system to deliver accurate fire while on the move.
The composite multi layered passive armor protection of the T-14 tank is built with steel made by electro-slag remelting and is combined with new composites to protect the T-14 tank against the most advanced modern weaponry.
The T-14 battle tank is equipped with the Chelyabinsk A-85-3A X-diesel engine that is capable of producing power up to 1500 hp. T -14 battle tank also has a tank information control system (TICS) that monitors all assemblies and components, diagnoses malfunctions and controls on-board systems.
Technical Specifications of the T-14  Armata War Tank
Armata Infographic credits screen capture from FMSO
T-14 tank can attack the target upto the range 7 to 8 km. It can fire targets at rate of 10-12 per minute. Maximum speed is 80 to 90 km/hr. Tank need to have a crew of 3 personnel to enter battle field. It has 7.62 mm remote controlled machine gun at the top. Engine can be replaced with new engine within half an hour. High resolution video cameras are used for seeing enemy targets.
Lance Abernethy man from Auckland, New Zealand Creates Smallest Drill Machine ever. He works as a maintenance engineer, fixing machinery in a factory.He likes creating small things when he was a kid.
The claims of being the World's smallest Drill Machine are unofficial as of now, However, Lance Abernethy does claim that this drill is the smallest one ever created.
Lance Abernethy 3d prints a working drill machine
3D printing (additive manufacturing) is any of various processes used to make a three-dimensional object. In 3D printing, additive processes are used, in which successive layers of material are laid down under computer control.
Drill Machine standing vertical on coin
To create the world’s smallest working drill, he used Ultimaker 2 3D printer. To make design he used a CAD software package called Onshape.
It took him 3 hours to solder and try and squeeze all the parts in. The wires keep on breaking off when he was trying to connect them and it was a difficult for him to hold them in place and try to not short the battery.
When the drill machine was completed it measures 17 mm ×7.5 mm ×13 mm dimensions. It holds a 0.5 mm twist drill and can drill through soft objects.

The animated infographic of how a four-stroke Otto-cycle engine works.
For loading this infographic animation might take 1 or 2 minutes to load depending upon your internet speed, please bear with us.

A Hammer is a mechanical tool that delivers a sudden impact to an object. Commonly hammers are used to drive nails, fit parts, forge metal and break apart objects. There are different types of Hammers, They vary in shape, size and structure. Here 23 different types of hammers pictures are shown below.

Brick Hammer
Brick Hammer

The chisel side scores a line around a brick. The brick hammer can break the brick in two parts.

Traditional curved-claw Hammer
Traditional curved-claw Hammer
Traditional curved-claw Hammer drives nails well and removes nails easily with the rocking action of its curved claw.

Body mechanic's Hammer
Body mechanic's Hammer
Body mechanic's hammer is used along with a small curved anvil called a dolly to remove dents from car panels.

Lineman's Hammer
Lineman's Hammer
Lineman's hammer is best suited to driving big lag screws and hammering bolts in utility-pole work.

Chasing Hammer
Chasing Hammer
Chasing hammers are designed and shape metal jewelry.

Titanium framing Hammer
Titanium framing Hammer
Titanium framing hammer has a titanium body with a sixteen-inch handle for maximum nail-extracting leverage.

Solid-steel framing Hammer
Solid-steel framing Hammer
Solid-steel framing Hammer is one-piece forged-steel design resists breakage and the waffle-pattern face grips nails.

Welder's Hammer
Welder's Hammer
Welder's hammer has weird-looking spring helps handle increases comfort and dissipates heat.

Ball-peen Hammer
Ball-peen Hammer
Ball-peen hammer can be used to shape the head of a rivet or reach into small recesses.

Tinner's Hammer
Tinner's Hammer
Tinner hammers are sharpened cross-peen can complete a folded seam or set a rolled edge.

Prospector's Hammer
Prospector's Hammer
Prospector's hammer has the head breaks rocks apart and the pick splits them cleanly along existing cracks.

Electrician's Hammer
Electrician's Hammer
Electrician's Hammer has a long-necked that helps electricians drive nails at hard places.

Drywall Hammer
Drywall Hammer
Chops errant bits of drywall and sets nails without breaking through walls' paper faces.

Toolmaker's Hammer
Toolmaker's Hammer
Toolmaker hammer is used for delicate work in the machine shop. The hole in the head has a magnifying glass.

Soft-face Hammer
Soft-face Hammer
Soft-face hammer is used to bend metal, wood, plastic or composite, When the surface must not be damaged.

Tack Hammer
Tack Hammer
Tack hammer has the split end of the head is, essentially, a horseshoe magnet for holding nails in place.

Dead-blow Hammer
Dead-blow Hammer
Dead-blow Hammer has an iron fist in a velvet glove. A non marring hammer that hits with tremendous force.

Railroad-spike maul Hammer
Railroad-spike maul Hammer
Railroad-spike maul Hammer is used for driving a railroad spike into a creosote-soaked tie.

Stone sledge Hammer
Stone sledge Hammer
Stone sledge Hammer is generally used for breaking giant rocks.

Blacksmith's sledge Hammer
Blacksmith's sledge Hammer
Blacksmith's sledge hammer is designed for shaping a bar of white-hot steel.

Sledge Hammer
Sledge Hammer
Sledge Hammer is best employed to drive wedges or knock rigid assemblies together or apart.

Bushing Hammer
Bushing Hammer
Bushing hammer looks like a three-pound meat tenderizer, but this adds a rough texture to stone.

Half-hatchet Hammer
Half-hatchet Hammer
Half hammer, half hatchet can be used for many purposes.

All 23 Hammers Image Courtesy: Popular Mechanics
Watt linkage is also known as the parallel linkage. Watt mechanical linkage was invented by James Watt. In Watt's linkage central moving point of is constrained to travel on an approximation to a straight line. Watt's Linkage can be found in some automobile vehicles at suspensions that allows the axle of a vehicle to travel vertically while preventing sideways motion.
Animation of Watt Linkage Mechanism

Application of Watt's Linkage:

Watt's linkage mechanism is used in the rear axle of some car suspensions as an improvement over the Panhard rod. These mechanism is used to prevent relative sideways motion between the axle and body of the car. It approximates a vertical straight line motion more closely and does so while locating the centre of the axle rather than toward one side of the vehicle, as commonly used when fitting a Panhard rod.
Panhard rod consists of two horizontal rods of equal length mounted each side to the wheels of automobile. At center of Panhard rod, a vertical bar is connected. The center of this vertical rod the point which is constrained to move in a straight line motion is mounted to the center of the axle. All pivoting points are free to rotate in a vertical plane.
Watt's Linkage Rear Suspension
Watt’s linkage can be seen in the rear suspension of above animation as two Panhard rods mounted opposite each other.
The Word's Biggest Aircraft is Airlander 10. It is a 300 feet long.
Airlander 10
Part blimp, part plane, part helicopter of Airlander 10 was originally created by British design company Hybrid Air Vehicles for military surveillance by the U.S. Army.
Airlander 10 world's lagest aircraft
This aircraft is named as Airlander 10 because it can carry weight of 10 tons, It is made of a bespoke fabric of carbon fiber, kevlar and mylar, while the pressure of the helium inside maintains the aircraft's shape.
To get off from the ground Airlander 10 uses 325 Hp V8 diesel engines, that power the propellers; the cockpit is designed for one pilot and one observer.