The drag force is a function of the fluid velocity and density along with the object's area and drag coefficient. The drag equation states that drag D is equal to the drag coefficient Cd times the density r times half of the velocity V squared times the reference area A. It always acts in the direction opposite to the flow velocity. A fluid flow past the surface of the body exerts a force on it.

Drag Forces. A car travels with a speed of 80 km.h-1 with a drag coefficient of 0.25. The drag coefficient of an automobile measures the way the automobile passes through the surrounding air. Calculate the speed a spherical rain drop would achieve falling from 5.00 km (a) in the absence of air drag (b) with air drag. When automobile companies design a new vehicle they take into consideration the automobile drag coefficient in addition to the other performance characteristics. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. D = Cd * A * .5 * r * V^2 For given air conditions, shape, and inclination of the object, we must determine a value for Cd to determine drag. By what factor does the drag force on a car increase as it goes from 65 to 110 km/h? Like friction, the drag force always opposes the motion of an object. $\begingroup$ You just have to use this formula for drag as a given expression for drag. These aerodynamic forces are the vector sum of the lift and drag. Knowing the drag force allows us to calculate the work required to overcome the drag force. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. The drag force is given as: Solution: Given: Velocity, V= 80 km.h-1. Density of fluid, ρ =1.2kg.m-3. Drag is a force that acts parallel to and in the same direction as the airflow. A vehicle uniformly accelerates from rest to 3.0 x 10^1 km/hr in 9.25 seconds and 42 meters. In fluid dynamics, the drag equation is a formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid.The equation is: = is the drag force, which is by definition the force component in the direction of the flow velocity, is the mass density of the fluid, is the flow velocity relative to the object, If the fluid is air this creates a wind force is nothing but typically called the Aerodynamic Forces. All horsepower in the calculator is measured at the flywheel. $\endgroup$ – fibonatic Apr 10 '14 at 17:52 $\begingroup$ P = w/delta t i think $\endgroup$ – Tim Apr 10 '14 at 17:59 The car manufacturers use this number because it is 15-20% percent higher than the horsepower at the wheels. The Quarter Mile Drag Racing Calculator is a convenient, fast, and easy way to calculate the quarter mile ET (elapsed time) and HP (horsepower) in the quarter mile drag race. While it is nice to know the Cd and Crr for your car, the real benefit here is that we can now accurately predict the total drag force on our car for any speed. If the cross-sectional area is 6m 2, calculate the drag force. Determine the average drag force acting on the vehicle. Drag coefficient, C d = 0.25. It is expressed in newtons (N). But do you know how to calculate power in general?

Cross-sectional area, A= 6m 2. If your car was a square brick, 3m x 0.8m x 0.8m, the most un-aerodynamic shape I can imagine, the drag coefficient is ~ 2.05 and the resulting drag force at 50 m/s is about 2000N Extreme case 2: aerodynamic body Drag Force Calculator calculates the force that resists the motion of a body through a fluid like air or water. Drag force acting on the airfoil is the data I would like to take from the simulation.