Drag Definition and 751 Threads

[SOLVED] Aeordynamics, drag, wind resistance - table with Cw values for objects Hello I am not using the standard template as this is a minor question in relation to my assignment, and not the actual questions from the assignment itself. I am calculating the curve of a projectile fired at...

Homework Statement A .63 kg ball is thrown up with an initial speed of 14 m/s and reaches a maximum height of 8.1m. How much energy is dissipated by the air drag acting on the ball during the ascent? Homework Equations KE= 1/2MV^2 The Attempt at a Solution I'm not very good at...

I have a problem in my D.E. class that is driving me nuts. Two drivers, A and B are in a race. Beginning from a standing start they both proceed at a constant acceleration. Driver A covers the last 1/4 of the distance in 3 seconds. Driver B covers the last 1/3 of the distance in 4 seconds...

Homework Statement I am unable to calculate air drag for a projectiles lab I am doing. It involves shooting elastic bands and measuring the distance they travel and compare it to the theoretical distance(with and without friction). It takes 0.45 seconds for the elastic band to fall and...

When an air passes over the wingtip of the airfoil, the upwash created at the leading edge 'reduces' the Angle of Attack, thus reducing lift. So why does this affect increase induced drag. The way I understand it, the greater the AoA (more lift), the more induced drag that is generated. Help...

The problem is to give a projectile an initial velocity such that it lands a certain height and distance away (2D system, only x and y dimensions). The forces to account for are gravity and air drag. The knowns are x is target horizontal distance to travel y is target height to travel g...

Homework Statement A 710 kg car drives at a constant speed of 23 m/s. It is subject to a drag force of 500N. What power is required from the car’s engine to drive the car a. on a level ground? b. up a hill with a slope of 2.0 0? Homework Equations P=Fv The Attempt at a...

Hi Does anyone know the drag coefficient of a missile. Would a missile have a lower drag coefficient then a torpedo? Thanks all

Hi, I have been trying to understand the formula for the drag of an object vs the depth of the object in Water. The variables are Velocity, Mass, Weight. Velocity being in Miles per Hour. Mass taken from the cross section of the weight as it moves through the water and the mass of the line used...

Homework Statement A projectile with mass m is fired upward with an initial speed v0. If the air drag varies with the square of speed F(v)=-kmv2 show that the projectile reaches a height of h=1/2k*ln[1+(kv0^2/g)] Homework Equations F0+F(v) =...

[SOLVED] How to solve for drag coefficient/terminal velocity? IGNORE THIS i was told by a classmate that all i need to do is take distance over time. :) thanks anyway I am doing a lab and I need to solve for both the drag coeffient and the terminal velocity for dropped...

Okay, I've been working on designing a custom mold cut for a 410-gauge shotgun slug and need some help with the principle of "Drag Stabilization". Many shotguns are smooth bores and thus shotgun slugs in order to dependably fly straight must have a drag-stabilized design. They can not depend...

Homework Statement Its a project where I have to create a scenario in which a dragster (Car A) has the highest top speed but loses the race(to Car B) That is all that is given to me, although some random things such as Apocalypses or random explosions are obviously not permitted...

Homework Statement An object dragged through an unknown fluid experiences a force opposite to that of its initial velocity (Vi) that is equal to -k(v^1/2). find the equation that models its instantaneous velocity Fn = Force Net Ff = Frictional force Vi = Initial Velocity V =...

my first post but i had to get this out before i explode! this has been bugging me to hell on this other forum i visit. there are a bunch of people insisting on "negative drag" is there such a thing? from what i understand drag is a force acting on an object moving through a fluid. and...

Homework Statement A baseball is thrown straight up. The drag force is proportional to v^{2}. In terms of g, what is the ball's acceleration when its speed is half its terminal speed and a) it is moving up? b) it is moving back down? Homework Equations \sum F=ma mg + bv^{2}=ma - When...

I'm currently working on an engineering project for my high school engineering course, and the knowledge of physics I should have for this project is more than I actually know. I want to build a catapult that can shoot a tennis ball at an 8” target on the ground from 30 feet away. I want to take...

This is a hypothetical question that I am curious about.. Suppose we are trying to design a projectile that is intended to travel at high hypersonic velocities, on the order of mach 10 or 20, through air (you can assume sea-level density for argument's sake). Would an ideally sharp round...

I have to write the equation of motion for a projectile thrown vertically, under quadratic air resistance. The forces acting on the projectile then are, gravity and the quadratic air resistance. Now, both forces are opposing the projectile, would that mean that if I make gravity negative...

Homework Statement A drag racer, starting from rest, speeds up for 402 m with an acceleration of +23.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -6.70 m/s2. How fast is the racer moving 3.35 102 m after the parachute opens? Homework Equations ? The...

Problem: To demonstrate the tremendous acceleration of a top fuel drag racer, you attempt to run your car into the back of a dragster that is "burning out" at the red light before the start of a race. (Burning out means spinning the tires at high speed to heat the tread and make the rubber...

Hi, I wanted to make an equation with Newtonian physics, but failed. Here's the problem: Consider an object with that ^ has m mass, and a built in drag & | magic motor that has P friction...

Hi guys I've been reading on the boards for a few days now and everyone here seems really helpful, so I've decided to come and ask for some guidence on a problem I've been having Homework Statement I have to find the terminal velocity of a smooth wooden ball. rho(ball)=420 kg/m^3...

Homework Statement For my Extended Essay I am modeling the flight path of a soccer ball under various conditions. Currently, I have a model for an extremely basic soccer kick with no spin and only gravitational forces, with no drag. My goal is to model the kick firstly with the addition of...

Homework Statement A particle of mass m is traveling along the x-axis with a constant horizontal velocity v0i. When the particle passes through the origin, it experiences a Drag Force which is proportional to the square of the particle's speed (Fd = - b/v^2i... drag coefficient b...

Prove this... A particle of mass m is traveling along the x-axis with a constant horizontal velocity v0i. When the particle passes through the origin, it experiences a Drag Force which is proportional to the square of the particle's speed (Fd = - b/v^2i... drag coefficient b. Questions A)...

As most of you know, the drag force equation is Fd=1/2*p*Cd*V^2*Cd*Ac. At terminal velocity, Fd equals weight. If you find the value of all the variables except Cd and V, you still won't have anything. But the terminal velocity equation is Vt= sqrrt of 2weight/p*Cd*Ac. So if V is terminal...

I know the equation for terminal velocity and drag coefficient. But I can't find one without the other. It's a real catch-22. I also don't know the Drag Force. HEEELP!

Hello everyone. I have researched from the internet that the drag force equation for projectile motion is either F= C p a v^2 or F= 0.5 C p a v^2. Which one is the correct one? The initial speed I am dealing with is about 20m/s. And what's the value for C for a normal tennis ball. Other sites...

Hey, is there any program that's easy to use for writing formulas on the computer (I'm thinking like a drag and drop type deal), preferably one that translates the formula to LaTex? I'm on Mac OS X. but I'm sure there has to be a web applet somewhere on the net that does this? thanks!

Homework Statement Need to energy dissipation by the drap force on a ball in free fall from height h and when it has reached terminal speed, assuming it happens before it hits thr ground. Drag force has magnitude bv^2, where b is drag coefficient and v is instantaneous speed of the ball...

Hi, I am designing an experiment for an individual project and it happens to involve aerodynamic. I wonder if someone can give me some idea of the drag coefficient of a square piece of flat paper (the normal 80grams photocopying paper) traveling through air against its face? (i.e. not...

Hi i am new in this forum, and i have a paper on aerodynamics, which is a bit general... Basically the paper is on how to affect lift and drag in automotives... could you help me with this... thanks

Hello, please help me I have a question regarding drag force and Newton's law of motion. This is quotes from online pdf files from University of Toronto Scarborough. "the terminal velocity is F/b , where b is drag constant Let’s solve the equation of motion and see how this is reflected...

Ok, I think I'm getting a hold on this problem, but I want to make sure I'm in the direction... Homework Statement Let \inline{v_\infty} be the terminal velocity of a falling body in air. If the body is dropped from rest, find the expression for the speed as a function of time (1) if the air...

Ok so (UK) A2 Physics coursework time came, and I stupidly thought that projectile motion would be a fun investigation. But after just a little research I found it most challenging, it's taken me 'round the houses' via Reynolds numbers etc, and I've come to a halt as I'm kinda stuck. I plan...

Hi, First of all, thanks for taking the time to read my post. I have started writing my own Particle System and I'm having trouble calculating where a particle would end up over a period of time. I have decided to use 3 foces, gravity, buoyancy and drag. I also decided to skip friction...

Alright so far I've got: Force of Drag = (.5)(A)(p)(V^2)(Cd) The only thing is I keep getting a Fd that is larger than Fg. Could someone explain to me how to figure out the acceleration an object falls at when experienced to a certain drag? Ex: 9.8 m/s/s is a freefalling object...

Homework Statement A dragster of mass m races another a distance d from a dead stop. Assume a constant instaneous power P for the entire race (provided by engine) and the dragster is like a particle. Find the elapsed time for the race. Homework Equations Well, P = Fv is needed for...

I'm interested in the prehistory of the history of relativity. In this history the nature of light and the ether comes in. One phenomenon that was debated in this context was stellar aberration: that the positions of the stars in the sky change slightly, or, more precisely, the perceived...

What minimum force is required to drag a carton of books across the floor at consant speed if the force is applied at an angle of 45 degrees to the horizontal? Take the mass of the carton 40 kg and the coefficient friction as 0.60. Someone PLEASE help me.. This is what i tried F=ma...

How does one relate the Reynolds number to the Drag Coeffient? It seems the drag coefficient for different velocities must be determined experimentally per set. I know the Reynolds number is a method to determine laminar or turbulent flow, but can it be used to determine the drag coefficient?

I am working on a model of a solar powered drag race. The race: 250 meters, no incline, initial velocity = 0. Classical physics gives us the following equations (ignores aero and rolling drag and wheel rotation): Velocity as a function of time V = (2Pt/M)^.5 P = power, M = mass...

Is there a (freeware?) program to calculate 3D lift and drag for simple flying bodies, e.g. ball, cylinder, cube, wing? There are programs to calculate lift and drag for foils (2D programs), e.g. javafoil of Martin Hepperle. Those programs could be used to study the flow in 2D only. E.g...

Not just a little rocket that goes a 1000 feet in the air, but one that can get into space. How does one take into account that the air density grows less with altitude, etc? Anyone know of any good resources for a problem like this?

A 75.0 kg skydiver can be modeled as a rectangular "box" with dimensions 24.0 cm\times 44.0 cm\times 184 cm. What is his terminal speed if he falls feet first? I know that drag = mg when terminal speed is reached. so drag is 75*9.8 and there's a formula drag = KV^2 where K is drag coeff...

I have a question about a physics problem, this comes from Barger's Classical Mechanics: A boat is slowed by a drag force, F(v) and its velocity decreases according to the formula v=c^2(t-t_{1})^2 where c is a constant and t_{1} is the time at which it stops. Find the force F(v) as a function...

Can anyone Please help me on this. I am totally stuck at this question . thanks... ...A sky diver of mass 80.0 (including parachute) jumps off a plane and begins her descent. Throughout this problem use 9.80 for the magnitude of the acceleration due to gravity. Q1. At the...

If the force of drag is proportional to the velocity, then: F_d = -kv However, the units of k are very strange. Does this mean that the model is completely wrong?

Hello all, I've been having some problems regarding the fall of an object in the vertical direction that has air drag which varies quadratically with speed. The problem is as shown: A gun is fired straight up. Assuming that the air drag on the bullet varies quadratically with speed. Show...