Rapid acceleration increases the weight of an object. How much is this increase in airplanes and in rockets?
106773
depends on the acceleration of the airplane or object. this found by vector addition. example: if an airplane or a rocket is falling freely (god forbid) all the objects inside will have 0 weight.
1151411
Objects of different mass do fall at the same speed, but air resistance hinders this fact.  For example, if you drop a bowling ball and a feather at the same time on the Earth, obviously the bowling ball falls faster. \n\nHowever, on the moon, when the astronauts dropped a feather and a bowling ball, they hit the ground at the same time. \n\nIt would seem that the bowling ball should fall faster since gravity is pulling on it with more force. But, with the more mass, comes more inertia, which meas it resists being pulled more than the feather. So, the feather is pulled less, but it resists less as well, so because of that, they will fall at the same time. The relationship between the force of pull and the object's inertial compensates exactly so that all objects fall at the same rate.
788979
For the add on: If a toy plane weighs two pounds, how fast should it accelerate? What unit of measurement would you use?\n\nNot sure what you're asking. Unless you're talking about how fast it would accelerate if you drop it. Then it would be vertically down at 32 ft/s^2 in a vacuum. No matter how much it weighs. (I'm using the English system units since you talked about pounds.)\n\nIf you're asking for an opinion of what would be a nice number for acceleration ... Well, if you wanted it to get up to a speed of 50 ft/s within 20 seconds:\nV = a*t or acceleration = V/t = (50 ft/s)/20 s = 2.5 ft/s^2\n\nI hope this helps
677923
Drag is the force of the air which interferes with the speed of the plane
412208
it can either increase the speed of the fall by reducing the air resistance or decrease it by creating more air resistance. think parachute and missle.
989278
The effect which causes weight is actually an acceleration, and in the case of on the surface of Earth it is due to gravity.  Weight may also be caused by acceleration due to motion in a straight line, such as with astronauts during liftoff having their weight "increased".\n\nSo to answer your question depends upon if any acceleration or deceleration is happening during the journey.  If the astronauts are moving toward another planet at a constant speed, then they are completely weightless.  (Well, they will of course be pulled a very tiny amount toward any gravitational sources, but unless they are massive and nearby, the effect will be practically insignificant.)  If they are moving under acceleration, then they will feel "weight" based upon the amount of acceleration.
709931
kaksi_guy: I think charlesellis753 is correct.  If we interpret the question as a fill in the blank, mass appears to be the best answer.\n\nIf the ______ of an object doubles, then the force required to accelerate it at the same rate will double.\n\nThat sentence is true is the blank is filled with 'mass'.
367999
It weighs the amount that the air inside it weighs.
899952
If you throw a ball across the room, it will stop accelerating as it leaves your hand.\n\nThe whole ball (including anything inside it) will carry on travelling according to the force you applied, but its direction will be altered by gravity (which is still pulling it downwards).\n\nThe shape it's flight makes is called a 'parabola', and this same shape happens whenever gravity stops an object from travelling upwards (even a purely vertical thrust will lead to some sideways movement; this is called 'Coriolis effect'), and makes it travel downwards instead.\n\nBecause the outside of the object is always travelling in the same direction as the objects inside it, they don't press on each other (their relative 'G' is zero). Because 'weight' is actually just relative pressure, the objects will seem weightless.\n\nThe American and Soviet 'vomit comets' are large transport aeroplanes with strengthened wing roots and a padded interior.\n\nThe pilot will first initiate a steep dive, and pull up out of this as if he is going to 'loop the loop'. Pulling up from a dive like this will press the passengers against the floor, so they seem heavier than normal; typically 3-4 times their normal weight (3-4G).\n\nAs the plane comes up from the dive, this extra 'G' will decrease, until it reaches zero, and the passengers feel 'weightless'. \n\nAt that point, the aeroplane is travelling upwards under the momentum of its own weight, like a roller coaster. If the pilot kept the engines accelerating, they would drive the plane upwards and press against the passengers, but by cutting the engines, the plane is left to rise like a thrown ball. It travels in a parabolic curve, but the passengers don't (they tend to bounce around in zigzags, perform somersaults for the camera, lose their sense of direction and start puking)\n\nAbout 40 seconds of weightlessness can be simulated in this way, because that's how long it takes for the plane to stop rising, and return to its downward dive speed. If it was left to dive for too long, pulling out of the dive would rip the wings off.\n\n(if that happened, the passengers would experience weightlessness (or very nearly; air resistance would slow the plane, but not them) all the way to the ground, but they wouldn't be able to tell us about it afterwards)
294601
Simply put, faster air moving over the top of the wing creates a lower pressure than the slower air under the wing.  This creates lift and causes the wing and the plane to rise.\n\nThe shape of an aircraft wing is curved on the top and flat on the bottom, the air has to move further on the top of the wing in the same time, so it moves faster creating lower pressure. \n\n(This is Bernoullis principle, higher speed = lower pressure, lower speed = higher pressure).  \n\nThe plane is propelled by a jet engine or propellor fast enough until lift is achieved.
728806
flying faster than the gravitational pull that is pulling you back
46446
it derives from equation x=0.5*a*t^2+v*t+x0 (I know equation in metric, maybe 0.5 isn't correct) where a is accelarion and v is start speed and x0 is starting place, a has been replaced by -32 which is gravity acceleration and v is assumed 0 and x0 by s.\n weight doesn't have any effect if there is no air pressure(usually you can think so) , it is famous that Galileo Galilei famous Italian scientist proved it from top of Pizza building with 2 different balls, they reach to the ground together.\nThe effect of air is a little complicated, it depends on the way you simulate it but usually it slow down the accelerate till the point that speed remains constant. Depends on the density of air and the shape of thing.\n there isn't any equation  which describes such a phenomena, you must solve the problem case by case.\nIf you like dynamic and static physics I recommend you The physics by Holliday, its a good book.
548339
Horse power can be used for both it is a value given to the amount of energy needed to perform (x) amount of work per second.\n  I believe you are more interested in thrust, which is the forward propulsion of the jet engine.  \n  That would go more towards ft/lbs.  \n\nOne extra little known tid bit.  The super jet engines like on the C-5 military transport uses some water injection on take off.  This is what causes the dark exhaust you see. \n\nIf I remember correctly when water flashes to steam it has a 1:26 pressure expasion rate.  \nAs you can see this has a significant impact on the amount of thrust for the engine as well as a cooling effect.\n\nAnd of course the lift is all by design of the wing.  If you took the wings off of a plane it would never get off the ground...  \n\n    But it would make one fast car !!!
794045
we have F= G*M*m/r^2  and F=weight\n\nwhen M=M and r= r/2 then F=G*M*m/ (r/2)^2\n\ntherefore F(new)= 4*F and hence new weight is 4 times.\n\nthis is due to change in the value of g(acceleration due to gravity)\n\nsince F=mg= G*M*m/r^2   and hence only g is effected\n\nand hence weight also changes mass remainig same.
21267
Gravity is the force of attraction between massive particles. Weight is determined by the mass of an object and its location in a gravitational field. While a great deal is known about the properties of gravity, the ultimate cause of the gravitational force remains an open question. General relativity is the most successful theory of gravitation to date. It postulates that mass and energy curve space-time, resulting in the phenomenon known as gravity.\n\nGravity is acceleration.  means that (if the mass is unvarying) there must be a force that causes a mass to accelerate. For a rocket ship, that is the rocket engine. For the earth, it is the compression of the mass between something on the surface of the earth and the earth's center of mass. The acceleration is in relation to spacetime in that the weight one feels is one's resistance to deviating from one's path in spacetime. The same holds true in the rocket ship except that a rocket engine supplies the force to accelerate an occupant from his spacetime path. There is no difference between the weight he feels because of gravity or the rocket.
709444
Acceleration on any free falling object is always equal to the force of gravity, which is 9.8m/s^2.\n\nSince acceleration is a vector quantity, it can be denoted as positive or negative. In this case, since the object is moving downwar and not up, acceleration would be negative and so equal to -9.8m/s^2.\n\nGood luck.
596583
Mass. I think.Depending on how strong the gravity is your mass changes.