why does an object fall when you let go of it in the air?
407965
Because as the earth spins, it creates a force called gravity. This force pulls all objects to the ground. You can create a simply lab to create gravity your self.\n\nDo this outdoors. Fill a bucket with water. Now whirl it around as fast as possiable. The water will stay in the bucket, even when it's upside down. This is due to the gravity created in the bucket. I hope this helps.
262699
If the object is dropped from a low enough altitude, it will impact before reaching terminal velocity, which is defined as "the speed at which a particular body's weight is balanced by its drag as it falls through a particular fluid" (ref.). Its maximum speed will be its speed at impact. Note that terminal velocity is a function of air density (which increases rapidly with decreasing altitude) and gravitational acceleration (which increases slowly with decreasing altitude).\nOtherwise the maximum speed is the terminal velocity at some point before impact and not the velocity at impact; in fact the peak speed may be much higher than either the velocity or the terminal velocity at impact. \nConsider an object dropped from a few hundred thousand feet altitude where the air is too thin to exert appreciable drag. Primarily due to gravity, the object reaches a fall rate of, say, a thousand ft/sec. As both fall rate and air density increase, eventually the drag force reaches the object's weight and it is at peak velocity and at terminal velocity for that altitude. After this, as air density increases further the terminal velocity decreases and the decelerating object's speed continually "seeks" the terminal velocity. Thus in this scenario the object reaches a peak speed that is greater than its final speed and its (decreasing) terminal velocity, which may be only a couple of hundred feet per second at impact.
448071
Because of it's position. If it's vertical. it would fall faster. If it's horizontal, there is more space for the air to push it up. It would fall slower because air molecules pushes it up as the leaf pushes air down. Have you heard of "Action-Reaction". All objects exert force to one another. Hope that helps.
301536
Weight = Acceleration*Mass\n\nAcceleration of the free fall is the earth gravity that is 9.797 645 m/s²\n\nWeight = 9.797645*Mass\n\nfree-falling object is an object which is falling under the sole influence of gravity; such an object has an acceleration on Earth of 9.8 m/s/s, downward. This numerical value for the acceleration of a free-falling object is such an important value that it has been given a special name. It is known as the acceleration of gravity – the acceleration for any object moving under the sole influence of gravity. As a matter of fact, this quantity known as the acceleration of gravity is such an important quantity that physicists have a special symbol to denote it – the symbol g. The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s. \n\nThere are slight variations in this numerical value (to the second decimal place) which are dependent primarily upon altitude. The Physics Classroom will use the approximated value of 10 m/s/s in order to reduce the complexity of the many mathematical tasks performed with this number. By so doing, you will be able to better focus on the conceptual nature of physics without sacrificing too much in the way of numerical accuracy. When the moment arises that you need to be accurate (such as in lab work), use the more accurate value of 9.8 m/s/s. \n\ng = 10 m/s/s, downward\n\nthe acceleration is the rate at which an object changes its velocity. Between any two points in an object's path, acceleration is the ratio of velocity change to the time taken to make that change. To accelerate at 10 m/s/s means to change your velocity by 10 m/s each second.\na = dv/t = 10/1 = 10\nthen if a body falls in the first second his speed is 10m/s and in the 2nd second is 20m/s and so on
252484
A brick falls to the ground without having a extremely significant arch. It also makes for a poor release because of it's weight. Thus, when someone yells brick, they want you to miss as if the ball went straight up and straight back down again.
611973
*******************************************************\n*It's not a paradox to begin w/!!!!  It's perspective.*\n*******************************************************\n\nThe question is "immovable object & irresistable force." It's a perspective thing. They do exist. The problem lies in the fact you're on the outside looking in on the system. \n\nWhat is the irresistable force? There IS only one. Gravity.\n\nWhat is your immovable object? Pick something. Anything.\n\nNow drop it. From your perspective the object falls to the ground. BUT what happens from the object's perspective? The ground jumps up and hits it, while the object remained still. It's your basic car window perspective question.\n\nIf using large enough objects, it can become a "matter shake."
796124
you will have to be in one point in the building to hear that the object will sound like a "musical scale going" down as it drops... but since objects on free fall accelerate, you would hear the 'musical scale going down" only at a very short time...\nso when you listen, listen carefully...
14021
The ball would bounce higher if the container kept a vacuum in it the entire time.  The first thing to understand is that there will not be pressure on top of the ball, there will be pretty much equal pressure around the ball from all sides; the air will spread evenly throught the container very rapidly.\n\nThis air will create drag, which will slow the descent of the ball and reduce the kinetic energy and momentum of the ball.  Drag and friction are called non-conservative forces, because when kinteic energy is lost to them, it is not transferred to another object, rather it is gone and not retrievable.  (It actually does get transferred, because no energy can truly be destroyed, but it is not retrieable.)\n\nSo what we have so far is a ball that is falling through dense air (greater pressure of a gas means a greater density of the gas), which is putting drag on the ball.  This means the ball does not fall as fast as it would in a vacuum, and the faster a rubber ball falls.  We then suck all the air out instantly, and the ball will bounce back up unrestricted by drag on its way up, but it would have bounced higher if it was not slwoed down by air during its fall and had a higher impact speed.
390529
If the unmovable object is not unbreakable, it WILL be broken. \nI believe this is an unanswerable question.
14589
My guess is 2 things... First of all, the lower the air pressure, the less resistance that the ball will encounter along its path.  Secondly, if the ball is hollow (e.g. a tennis ball or basket ball) then the pressure difference between the inside and outside of the ball will reflect how easily it will bounce.
223530
How about the adding of Gravitational Potential Energy (GPE) and Kinetic Energy (KE) as an object falls in the air to demonstrate the preservation of energy?\n\nBefore it falls all energy is GPE, as it falls GPE is converted to KE until just before it hits the floor then it is all KE.
80665
well as they said, the ball falls faster  than the feather, not becuase its heavier, not that gravity is more on it. its because of the simple reason, air risistence. in vacum, where there is no air , itll take the same time for both to reach ground.
128500
The object will follow a parabolic trajectory to the earth, as observed from outside the plane.  On the plane, it will appear to fall straight down in your (moving) frame of reference.  Air resistance will retard this motion, but it's magnitude depends on the drag coefficient of the object dropped and the medium in which it is falling.
110828
Archimedes said: When an object is submerged in water, there is a buoyant force upwards on it that is equivalent to the weight of the water displaced. \n\nSo if you have a heavy object underwater, and it is displacing water, its net weight will be less than when it is in air, displacing air, which is much lighter, so has a much smaller buoyant effect.
119853
Because if we sit down on it in the middle of the nite we fall in!!!  if you dont pick it up in the middle of the nite what happens? nothing other than we sit on droplets!!  its a no win.. except i hate to fall in lmao
897109
atmospheric pressure decreases as altitude increases.\n(think about gravity)\n\nan object that floats is less dense than the fluid it floats in.\n"A piece of the object weighs less than a piece of the fluid the same size."
875025
How about using it in a sentence and discussing it?\n\nIf an object is dropped from a great height, so that it will fall for a significant period of time, the force of gravity will accelerate the object downward. But as it accelerates, the air through which it passes will resist its motion (wind resistance) with a force that increases as its downward velocity increases. \n\nEventually the object will have been accelerated to a velocity at which the force of wind resistance equals the force of gravity. At that point, the net force on the object is 0 (wind resistance offsets gravity), and its acceleration will also be 0 (F = ma, so in this case 0 = m (0)). The velocity at which this occurs is called the "terminal velocity." It could be called the equilibrium velocity, or the ultimate velocity, or any other descriptive name, but we have come to call it "terminal velocity."\n\nNote that terminal velocity is not a fixed number. Obviously, terminal velocity is rather slow in the case of a balloon (and negative in the case of a helium balloon), since its wind resistance is great relative to its mass. And for a dense, streamlined object (think of a steel spear), terminal velocity would be extremely high, perhaps approaching the speed of sound (Mach 1). \n\nBesides the density and shape of the object, other variables that affect terminal velocity include air density and the force of gravity, both of which are significantly reduced at very high altitudes.