why do a coin and a feather fall with different acceleration in the presence of air?
143334
i think its because of the air pressure. the air drags the feather up? i think
749375
You mean at the same rate - 32.2 feet per second per second.\n\nGravity pulls on all matter at the same rate. If you drop a bowling ball taped to a baseball, they will fall at the same rate. But it is not because the bowling ball is pulling on the baseball, it is because gravity is pulling on both of them. If the tape breaks gravity will still be pulling on both of them at the same rate. They will hit the ground at the same speed, however, they will hit with different forces. Because Force = mass x acceleration. The acceleration is the same for both of them. But the mass of the bowling ball is larger than the mass of the baseball, so it will hit the ground with more force.
606294
If they were in the same place and time, 'same' mathematically, they would fall at same speed.\n\nIf they were in different places or time, the forces exert on them may be different e.g. the moon which cause tides, and the gravitational acceleration 'g' is different from place to place.\n\nMy answer is different, coz' I am not a physicist but an engineer. I take everything into account. Of course, there are many forces beside gravitation and air resistant.\n\n"No air resistant" doesn't mean that there is only gravity. Besides, gravity different from place to place.
1103152
Falling objects do not fall at a constant speed, they accelerate (get faster) the longer they fall. In a vacuum (no air resistance) two objects of the same mass (weight) experience the same acceleration. So if they're dropped from the same height, they will hit the ground at the same time. \n\nIn the atmosphere, air resistance will diminish the force of gravity, so two objects of different shape or density would accelerate at different rates because of different air resistance.
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.
1163141
yes .. in vacuum, all items will fall at same rate... it is the rate at which the gravity acceleration attacts everything to the center of teh Earth. But you might have a queation, that if the acceleration  is same then why different things weigh different... \n\nweight =mass X acceleration of gravity (9.8meter/second^2) and mass is the one which is a measure of matter in a body makes the difference... so if you let a 5kg weight and a 5,000kg weight fall in a vaccum, they will fall at the same rate and will reach the ground at the same time.
400216
It depends on windspeed and direction, and the planes direction in relavence to that speed and direction. It depends on the speed of the plane. It depends on the density of the object, because of wind resistance. EX. feather would be close, lead ball would be further. Your question is like me saying, "I am in a car, how long will it take me to get to McDonalds?" Not enough info
76013
imagine a huge mountain. everytime a bird flies over it, its feathers touches the mountain and causes some rock and soil to fall.... this happens once every year..... by the time the mountain is leveled to the ground, eternity is just starting.....
805410
Let me ask you a question. \n\n If I shot a bullet straight up, and then dropped a feather..  would the falling object move faster than the one going upwards?
214151
They fall at the same rate because the acceleration of gravity on earth is nine point eight one meters per second squared. Because gravity is pulling them at the same rate, they fall at the same time. \n\nThey fall slower on the moon because gravity is less.
616393
Any thing moving through the atmosphere experiences the force of gravity and a drag force due to the friction of the air as it moves through it. When the object is falling, the force of gravity is directed towards the ground and the drag force directed upwards. As the body moves faster, the drag force becomes larger and larger until it equals the force of gravity and the object then falls at a constant velocity. This velocity is called the terminal velocity. For a person jumping out of an airplane, in skydiving, it is roughly 120-150 miles per hour. The terminal velocity of a water drop is much smaller. A large raindrop (5 mm in diameter) will fall at a velocity of around 20 mph. If you get hit by a large raindrop you will definitely feel it. However its still not large enough to cause much pain. The smaller the raindrop the slower it falls and hence the less energy it has when it hits you. If you dropped a grain of sand the same size as a raindrop it wouldn't hurt either. Pebbles are much heavier than raindrops and hit your head with a lot more force. Force is directly proportional to the mass and velocity of an object.\n\nOf course hail, which is really just a bunch of frozen raindrops which have joined together, is actually less dense than water but will certainly hurt due to its large mass.
918435
If the feather floats at a constant velocity of 2.0m/s, it means that it is in equilibrium, i.e. its weight must be equal to the air resistance. Therefore, \n\nWeight=0.0005*9.8\n           =0.0049N\nAir resistance=0.0049N\n\nAgain since the feather is floating at a constant velocity of 2m/s, you can use the formula:\n\nTime=Distance/velocity\n       =10/2\n       =5s\n\nNote: this formula is not applicable if the feather were accelerating downwards.
669843
david scott did this on the moon.  the two objects were an aluminum hammer and a falcon feather.\n\nDuring the final minutes of the third extravehicular activity, a short demonstration experiment was conducted. A heavy object (a 1.32-kg aluminum geological hammer) and a light object (a 0.03-kg falcon feather) were released simultaneously from approximately the same height (approximately 1.6 m) and were allowed to fall to the surface. Within the accuracy of the simultaneous release, the objects were observed to undergo the same acceleration and strike the lunar surface simultaneously, which was a result predicted by well-established theory, but a result nonetheless reassuring considering both the number of viewers that witnessed the experiment and the fact that the homeward journey was based critically on the validity of the particular theory being tested.\n\nwatch this:\nhttp://nssdc.gsfc.nasa.gov/planetary/image/featherdrop_sound.mov
783086
Gravity is pulling down on the object, air is resisting it (pushing up, if you will) and causing friction, and if there's any wind it's pushing sideways on the object. I doubt you'd have wind in your problem, though. Wind is complicated :)
1180056
Consider a ball that is spinning about an axis perpendicular to the flow of air across it (see left). The air travels faster relative to the center of the ball where the periphery of the ball is moving in the same direction as the airflow. This reduces the pressure, according to Bernouilli's principle. The opposite effect happens on the other side of the ball, where the air travels slower relative to the center of the ball. There is therefore an imbalance in the forces and the ball deflects - or, as Sir J J Thomson put it in 1910, "the ball follows its nose". This lateral deflection of a ball in flight is generally known as the "Magnus effect".
729735
both are the same if it is drop at the same height because the gravity speed is 10 ms-2 (9.81ms-2 more accurate)
505706
the striker transfers some of its momentum to the coins. if it hits a coin straight (in line with the COM) and if the collision is elastic, the striker should com to a stop and the coin wil aquire its momentum.