what is air resistance? Fluid friction what is terminal velocity? very fastest speed of an object?

Answer 1

Fluid friction: The friction between the layers of molecules in a fluid.

Air resistance: the frictional force from the air that resists the forward motion of the object

Terminal velocity: Terminal velocity occurs when the weigh of an object is equal to air resistance. Constant speed

Answer 2

Terminal velocity

The terminal velocity of an object falling towards the earth, in non-vacuum, is the speed at which the gravitational force pulling it downwards is equal and opposite to the atmospheric drag (also called air resistance) pushing it upwards. At this speed, the object ceases to accelerate downwards and falls at constant speed. An object moving downwards at greater than terminal velocity (for example because it previously used power to descend, it fell from a thinner part of the atmosphere or it changed shape) will slow until it reaches terminal velocity.

For example, the terminal velocity of a skydiver in a normal free-fall position with a closed parachute is about 195 km/h (120 mph or 54 m/s). This velocity is the asymptotic limiting value of the acceleration process, since the effective forces on the body more and more closely balance each other as it is approached. In this example, a speed of 50% of terminal velocity is reached after only about 3 seconds, while it takes 8 seconds to reach 90%, 15 seconds to reach 99% and so on.

Higher speeds can be attained if the skydiver pulls in his limbs (see also freeflying). In this case, the terminal velocity increases to about 320 km/h (200 mph or 89 m/s), which is also the maximum speed of the Peregrine Falcon diving down on its prey.

fastest human on the planet.

An object falling will fall 9.8 meters per second faster per second. The reason an object reaches a terminal velocity is that the drag force resisting motion is directly proportional to the square of its speed. At low speeds the drag is much less than the gravitational force and so the object accelerates. As it speeds up the drag increases, until eventually it equals the weight. Drag also depends on the cross sectional area. This is why things with a large surface area such as parachutes have a lower terminal velocity than small objects like cannon balls.




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Note that the density increases with decreasing altitude, ca. 1% per 80 m (see barometric formula). Therefore, for every 160 m of falling, the "terminal" velocity decreases 1%. After reaching the local terminal velocity, while continuing the fall, speed decreases to change with the local terminal velocity

Answer 3

As an object falls through air it is accelerated due to the gravitational force, eventually the drag force, frictional force resistance of the air molecules interacting with the following body causes the object to stop accelerating. The object then falls the remainder of its distance at constant velocity (Terminal velocity) until it hits the ground. All of this is assumed if the object is dropped from high enough of a distance to attain Terminal velocity

Answer 4

Air resistance is the force of air against a falling object, the larger the object's area, the greater the air resistance, the slower you fall. Example: A sheet of paper has a greater air resistance than a crumpled paper ball.

Answer 5

Just to clarify for barefoot_always...gases and liquids are both fluids i.e. air resistance is a result of a fluid friction, the fluid being the mixture of nitrogen, oxygen, carbon dioxide, etc. that make up the air.

Answer 6

On the freeway stick your arm way out the open window, you'll learn all about air/wind resistance! Fluid is the same thing, with like boats. Drag against trying to move forward.

Answer 7

terminal velocity is max speed you can get while falling - when gravity exactly equals air resistance.

it depends on weight and shape of object (hence parachutes)