In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, drag force depends on velocity.Drag force is proportional to the velocity for a laminar flow and the squared velocity for a turbulent flow. Even though the ultimate cause of a drag is viscous friction, the turbulent drag is independent of viscosity.Drag forces always decrease fluid velocity relative to the solid object in the fluid's path.
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...
Hi,
I have second doubts on air drag problem.
Let's say an object is moving with speed v_obj = 15 m/s and that the air is moving with speed v_wind = -2 m/s. What is the the force of air drag? If There would be no wind. The force would be 1/2*drag coeff.*density of air*area*v_obj^2. But...
Hello, I have very interesting physics problem. But i really have no idea how to solve it... Maybe somebody can give me some useful hints?
Here we go:
"Air drag (air resistance, drag) is a resisitvie force which is the result of a moving object colliding with air molecules. Dervie the drag...
A 49kg skier leaves the end of a ski-jump ramp with a velocity of 28 m/s directed 22o above the horizantal. Suppose that as a result of air drag the skier returns to the ground with a speed of 17 m/s, landing 10 meters vertically below the ramp. From the launch to the return to the ground, by...
free fall with drag force
If the equation F=-bv^2 describes the drag force of an object...then the differential equation for the object's motion would be:
dv/dt= -g+bv/m
or is it...
dv/dt= g-bv/m
After solving the equation, should I get...
V=mg/b[1-e^(-bt/m)]
Also, does this...
If a vehicle could continuously cool the air in front of it and heat the air behind it, the air in front should contract and the air behind expand, reducing the pressure in front of the vehilce and increasing it behind the vehicle. This should pull the vehicle into the cooler air at the front...
a crate falls from an airplane flying horizontally at an altitude of 2,000 m. neglecting air drag, howlong will the crate take to strike the ground/ is the formula t = d/v help
Since my other thread is lacking attention, perhaps it is more suitable here:
I inserted some fixed constants and multiplied out
(48/.5)(1-^e-.5t)(sin 45) + (9.8/.25)(1-(.5t) - e^-.5t) = 0
(96 - 96e^-.5t)(sin 45) + 39.2(1-(.5t)-e^-.5t) = 0
67.88 - 67.88^e-.5t + 39.2 - 19.6t -...