An object moving through a fluid experiences a retarding force known as drag force. The drag force _ as the speed of the object _
Correct answer: D. Increases_ Increases
- A. Remains Constant--- Increases
- B. Decreases _ Increases
- C. Increases _ Decreases
- D. Increases_ Increases
Explanation
Drag is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.You feel the drag force when you move your hand through the water. You might also feel it if you move your hand during a strong wind. The faster you move your hand, the harder it is to move.Drag force FD is propotional to the square of the speed of the objects. Mathematically,FD = 1/2 C p Av2,Drag force is directly proportional to the square of velocity, so as the speed of the body increases drag force increases.
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About Fluid Dynamics
Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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