![]() ![]() Things fall slower under water than in air.Īm I going about it the right way, if not, where am I going wrong etc. U = viscosity of fluid, I used 0.00179 Pa.sĬ = drag coefficient of cylinder, I used 0.82Įqn1 doesn’t give me physically possible number as answer (>9k), eqn 2 could be, i.e. H = height/length of cylinder, I used 30cm G = acceleration due to gravity (9.8m/s^2) I then rearranged for velocity, my objective is to isolate velocity inclusive of drag, then I can use that new calculated velocity in the original work energy principle and get the new impact force. ![]() I rewrote the equations with all the available parameters: An online free fall calculator helps you to determine the speed, time, and height of a freely falling object under the influence of the gravitational force. So here I used įb = volume of cylinder X density of fluid X accel due to gravity = PIr^2hpgįor drag I used either Fd = 6PIuvd or Fd = 0.5CpAv^2 in each calculation. The Free Fall Calculator calculates an objects free fall energy in a fraction of a second, saving you time. Using the principle that the forces of buoyancy and drag are equal to the force of it falling mg=Fb+Fd, I started to try and work things out.īuoyancy force I used is the displaced fluid weight times the accel due to gravity. I got a couple of equations, one being stokes Fd = 6PIuvd and the other being Fd = 0.5CpAv^2. I started with the work energy principle and net work done to calculate the impact force, but now I am trying to include the drag from the water. The cylinder is restricted to vertical falling, so cannot tumble down so to speak. I’m trying to calculate the impact force of a free falling cylinder of metal under water accounting for the drag. We say an object is in free fall when the only force acting on it is the earths gravitational. ![]() With air resistance acting on an object that has been dropped, the object will eventually reach a terminal velocity, which is around 53 m/s (190 km/h or 118 mph 4) for a human skydiver. I posted this problem in another section, but it seems to have fizzled out and I’m trying to solve it, so resurrected it here hopefully to get somewhere. Near the surface of the Earth, an object in free fall in a vacuum will accelerate at approximately 9.8 m/s 2, independent of its mass. ![]()
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