What Is Air Resistance For Kids?
Air resistance and streamlining
Air resistance is what causes a feather to fall. It lacks the weight to overcome the air resistance and has a lot of surface area for the air to make contact with. If you want to slide a toy car across a smooth piece of wood, the wheels are not generating much force against the smooth surface, so it will move quite easily.
If you slide the same toy car across a thick carpet, you will need to give it more of a push to stop, and it will stop quicker. Increased friction is a consequence. Air resistance is a force caused by air.
The air particles hit the front of the object. The greater the surface area, the more air particles hit the object. The speed of the object and the cross-sectional area of the object are the main factors that affect air resistance.
The more air resistance there is, the faster an object is going. An increased area leads to an increased amount of air resistance. One way to test how streamlining works is to make your own paper airplanes.
Get some pieces of paper, screw them up, and then watch which one falls faster. You can see how a streamlined shape affects how fast you fall. A manuscript from the 1470s has an early version of a parachute, which was before Galileo started hurtling cannonballs off of buildings.
The bicycle in space
The force pushing the bicycle forward is larger than the force that is pushing the bicycle forward. Most of the force that you put on the pedal goes towards speeding up the bicycle. Light objects like feathers are not very strong in the gravity that is acting on them.
The air is all over the place. Light objects fall slower when there is a lot of air resistance. A leaf falls from a tree and floats down to the ground.
Air resistance is pushed up against the leaf. The bigger the surface area, the more resistance there is. The pull of gravity is not as strong as the force of the air resistance.
The leaf is falling slowly. There are no particles of water or air in space. There is no resistance in space.
Arrows and Force Action
Children are asked to use arrows to see the direction and size of the forces acting on objects. The forces acting upon the plane are shown.
Drag force on a body
The drag force is dependent on the square of the velocity. The body increases its drag and its speed. It is at a point where the drag is equal to the weight.
Drag in Aircraft
drag is the field of aerodynamics and it is the main factor in the design of aircraft. The streamlined design of most jet aircraft and rockets allows them to pass through the atmosphere with less drag. Cars and trains use different designs for the same purpose.
The physics of supersonic flight
Here, Pd is the power needed to overcome the drag force, Fd is the drag force, v is the velocity, p is the density of the fluid, A is the cross-section area, and Cd is the speed of the object relative to sound. The cube of the velocity is power needs, so if it takes 10hp to go 80 kph, it will take 80hp to go 160 kph. doubling speed requires an application of eight times the power.
Waves are formed at the leading and trailing edges of the body in supersonic flight. In super fast flows bow waves will form. Waves are separated into two components, supersonic lift-dependent wave drag and supersonic volume- dependent wave drag.
The picture of an F-22 does not show supersonic flight. The aircraft is in a high-G turn which causes the pressure on the wing to decrease, but it does not correspond to supersonic flight. It would like a very small cone and not spread over the length of the aircraft.
The Parachuting Method
The objects are pulled toward the Earth by gravity. The terminal velocity is the top speed of the objects falling. No one could survive hitting the ground with such force.
The parachute reduces the fall's speed so that it can be safely landed. The canopy is designed to be strong and strong enough to hold the parachute. The canopy is made of panels.
Each gore consists of several smaller nylon sections sewn together in a way that a tear will usually be confined to the section in which it originated. The direction of the weave in each section adds strength. The canopy is connected to the harness by suspension lines.
Each shroud is a line. It is secured to a ring on the harness and then it is passed through a canopy and back to the harness. There are three ways to parachut.
The ripcord is activated by different means. A parachutist jumps out of the plane and pulls the ripcord after clearing the craft. A wire cable is fixed to the airplane in a static jump.